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Straighterline Statistics Final Exam Questions & Answers, Exams of Advanced Education

Straighterline Statistics Final Exam Questions & Answers

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2024/2025

Available from 04/09/2025

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Straighterline Statistics Final Exam
Questions & Answers
anais is organizing her rock collection and places each rock in one of three categories:
small, medium, or large. this illustrates what level of measurement? - correct Answer-
ordinal
which of the following is an example of a nominal variable? - correct Answer-gender
what sort of data are temperature measurements? - correct Answer-ratio
based on the graph, which statement best describes the relationship between daily high
temperatures and the number of people going to the beach? - correct Answer-it is
negative linear relationship
the table shows the number of train tickets carl purchased to each station over the last
month and the fare to each station. what was the average cost per ride? - correct
Answer-$5.45
the outcomes observes in an experiment are: 2, 8, 3, 10, 4, and 9. what is the sample
variance? - correct Answer-11.6
jason collects information about annual family income from each student at his college.
he computes both the mean and median family income across all students and is
surprised to find that the mean income is higher than the median income. what is the
most likely reason for the difference in the mean and the median? - correct Answer-the
mean is more affected by a small number of extreme values
an instructor administers a test to a class of 30 students and observes that the scores
are close to normally distributed with a mean score of 40 and a standard deviation of
10. what can you conclude from these results? - correct Answer-the average student
scored at the 40th percentile
laura's quiz scores during the semester were 87, 82, 90, 92, and 84. what was her
mean score - correct Answer-87
the table lists the populations and relative frequencies of car ownership in 4 neighboring
cities. which city has the most cars? - correct Answer-westville
in the figure shown, sample a and sample b have the same - correct Answer-median
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Straighterline Statistics Final Exam

Questions & Answers

anais is organizing her rock collection and places each rock in one of three categories: small, medium, or large. this illustrates what level of measurement? - correct Answer- ordinal which of the following is an example of a nominal variable? - correct Answer-gender what sort of data are temperature measurements? - correct Answer-ratio based on the graph, which statement best describes the relationship between daily high temperatures and the number of people going to the beach? - correct Answer-it is negative linear relationship the table shows the number of train tickets carl purchased to each station over the last month and the fare to each station. what was the average cost per ride? - correct Answer-$5. the outcomes observes in an experiment are: 2, 8, 3, 10, 4, and 9. what is the sample variance? - correct Answer-11. jason collects information about annual family income from each student at his college. he computes both the mean and median family income across all students and is surprised to find that the mean income is higher than the median income. what is the most likely reason for the difference in the mean and the median? - correct Answer-the mean is more affected by a small number of extreme values an instructor administers a test to a class of 30 students and observes that the scores are close to normally distributed with a mean score of 40 and a standard deviation of

  1. what can you conclude from these results? - correct Answer-the average student scored at the 40th percentile laura's quiz scores during the semester were 87, 82, 90, 92, and 84. what was her mean score - correct Answer- the table lists the populations and relative frequencies of car ownership in 4 neighboring cities. which city has the most cars? - correct Answer-westville in the figure shown, sample a and sample b have the same - correct Answer-median

the contingency table describes the living arrangements of students at a small college. what percentage of the students are women who live in off-campus housing? - correct Answer- which of these correlation coefficients shows the strongest linear relationship between 2 variables - correct Answer--0. what conclusion can be drawn from the graph of average daily temperature and hot beverage sales - correct Answer-there is a negative correlation between average daily temperature and hot beverage sales the coefficient of correlation r is a measurement of statistical relationships that are - correct Answer-linear a bag contains marbles of different colors (red, yellow, and blue) and different sizes (small and large). the probability of picking a blue marble out of the bag is 0.10 and the probability of picking a large marble is 0.50. what is the probability of picking a large blue marble - correct Answer-0. a swimmer, sarah, hopes to compete in an upcoming meet. there are 8 team members eligible for the breaststroke event at the meet, but only 1 team member will be randomly selected to compete in that event. there are 4 team members eligible for the butterfly event at the meet, but only 1 team member will be randomly selected to compete in that event. sarah is eligible to compete in both events. what is her chance of being selected for at least one of the two events - correct Answer-3 in 8 A researcher wants to test the hypothesis that right handed people will have different visual, acuity, and their left and right eyes. What sort of test should the researcher use?

  • correct Answer-One tailed test with two independent samples To test the effectiveness of a new therapy, a researcher compares the Helt outcomes of 45 patients who receive the therapy and 38 patients in a control condition. In a two tailed test, the researcher obtains a T statistic of 1.83. What is the strictest threshold at which this result could be considered significant? - correct Answer-P<0. A researcher is conducting a study comparing the effects of drug treatments on hours of sleep across three groups. Group one is taking drug a, group 2 is taking rugby, and group 3 is a control group not taking any drug. What statistic would be most appropriate to compare the main number of hours of sleep across the three groups. - correct Answer-Analysis of variance What does the denominator represent in the formula for an F statistic used in an ANOVA - correct Answer-Variation within treatment groups What is one way that the F statistic differs from the T statistic? - correct Answer-It can never be negative

star rating. Based on this information, what is the probability of a restaurant receiving a four star rating? - correct Answer-0. The table shows the likelihood that a team will score a certain number of touchdowns in a football game. What is the probability that the team will score at least two touchdowns? - correct Answer-0. The main score on a college entrance exam is 1200, and the standard deviation is 100. If the scores are normally distributed, what is the likelihood of the score greater than 1450? - correct Answer-0. What type of distribution is depicted in the graph? - correct Answer-Normal A school gives an exam for which the scores are normally distributed. What proportion of students score within 2.3 standard deviations of the mean? - correct Answer-0. The mean score for 18 holes of golf on the parkvale municipal course is 68, with a standard deviation of 12. Low score is 95. What is Z - score does this correspond to? - correct Answer-2. Damien determines that the difference is he found in his study are statistically significant at the 0.05 level of significance. What is the correct interpretation of the finding? - correct Answer-95% of the study participants achieve the level of performance expected The central limit theorem says that if the sample size doubles, the sampling distribution of the sample mean will - correct Answer-Approach a normal distribution Scores on a certain standard achievement test are normally distributed with mean μ = 100 and standard deviation σ= 10. If you take multiple samples of size 16, what percent of sample of means will be between 95 and 105. - correct Answer-95.4% A student performed a chi square test with 5° of freedom. What would be the critical value of the chi square statistic, assuming a significance level of P< 0.05 - correct Answer-11. Withdrawn from a normal distribution, 95% of the sample means will fall within how many standard deviations of the population - correct Answer-1. A maple syrup manufacturer asked 100 customers to rate its brand of maple syrup on a scale of one to 10. The mean rating was seven, with a sample standard deviation of 1.5. Based on this sample, what is the 95% confidence interval for the estimate of the population mean? - correct Answer-(6.7, 7.3) A regression analysis suggest that the number of children and employee has predicts the number of personal days he/she will take off work. The life of the regression line is

3.2 and the lower bound of the confidence interval for this slope is 0.8. What is the upper bound? - correct Answer-5. A coach was just to determine whether her basketball team is performing worse this year than in previous years. The coach knows that over the past several years games, the team scored an average of 84 points in the last year, with 36 games, they scored an average of only 71 points, with a standard deviation of 24 points. What T test statistic does this score correspond to? - correct Answer--3. In a statistical analysis, how does the T distribution differ from the z distribution? - correct Answer-It depends on sample size In hypothesis testing, a type one error occurs when - correct Answer-A chance result is reported as statistically significant An analyst predicts that clients who use a certain investment strategy will have below average profits. With a sample of 21 clients, the analyst performs a one tailed T test of this hypothesis at the 95% confidence level, resulting in a statistic of -1.65. How should the analyst interpret the result? - correct Answer-The null hypothesis is not rejected A researcher test the hypothesis that math scores are significantly different between two groups of students. The test yields a p value of 0.01. What is the correct interpretation of this value? - correct Answer-The two score distributions have common values one percent of the time A class of 25 students took a reading test before, and after completing an intensive vocabulary course to determine whether there was a change in scores in either direction. The mean pretest score was 24, and the mean post test score was 32. The standard deviation of the difference was nine. What value of the T statistic does this difference correspond to? - correct Answer-4. A researcher is studying the relationship between academic and sports performance in 100 college athletes. She runs a regression model with the number of games started as the independent variable and grade point average as the dependent variable this model yields a slope of B = 0.3. A two tail test of this estimate produces a T statistics of -2. assuming a significance threshold of P < 0.05, how should the researcher interpret these results? - correct Answer-Each additional gameplay is associated with a 0. decline in GPA Sociologist wants to examine academic performance across grade levels in an elementary school. The number of students is not the same in each grade. Which sampling method would be most appropriate? - correct Answer-Stratified random sampling A researcher asked children to complete a math test. Half of the children are told they will be rewarded for every correct answer; the other will receive the reward. The