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Material Type: Exam; Professor: Maxson; Class: Probability and Statistics; Subject: Mathematics; University: Walters State Community College; Term: Unknown 1989;
Typology: Exams
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Math 1530 Chapter 7 Review Questions
2a. Assume that the data has a normal distribution and sigma (σ) is not known. The sample size is
2a. Right tail test, α = 0.1. (Hint: Use Table A-3)
2b. Left tail test, α = 0.05.
2c. Two tailed test, α = 0.
a. The claim is that the mean is 0.21; the sample statistics include: n = 32; x-bar = 0.83, s = 0.24.
b. The claim is that the mean < 1.39; sample stats include: n = 87; x-bar = 0.83; s = 0.16.
c. The claim is that the mean is at least 50; sample stats include: n = 100; x-bar = 54.8; s = 3.
Chapter 9:
The following data represent the gestation period of various animals along with their life expectancy. A zoologist would like to determine if he could use gestation/incubation time to predict the life expectancy of the animal.
Animal Gestation Period (days) (x)
Life Expectancy (yrs)
Animal Gestation Period (days) (x)
Life Expectancy (yrs)
Cat 63 11 Chicken 22 7. Dog 63 11 Duck 28 10 Goat 151 12 Lion 108 10 Parakeet 18 8 Pig 115 10 Rabbit 31 7 Squirrel 44 9 Source: Time Almanac 2000
a. Find the value of the linear correlation coefficient r. b. How would you describe this relationship? (in terms of strength and direction) c. Give the coefficient of determination (r^2 )and d. explain its meaning. (Write the sentence: “____% of the variation in ……….” e. Write the equation that best models the data (the regression equation). f. Write a description of this equation in context of the data … in terms of “life expectancy” and “gestation period”. g. Use your regression equation to predict the life expectancy of a guinea pig. (Gestation period of a guinea pig is 68 days.)