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Quis Regression Statistic, Quizzes of Statistics

Quis Regression Statistic berserta jawaban

Typology: Quizzes

2018/2019

Available from 12/05/2021

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Kurnia Ramadhan
19312185
Quiz 10 : Regression
The Quiz Materials are :
a. Scatterplots and regression
b. Correlation coefficient and the residual
c. Coefficient of determination and RMSE (root mean square error)
d. Chi-square tests
Name *
Class *
IF 19 B
NPM *
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Kurnia Ramadhan

Quiz 10 : Regression

The Quiz Materials are : a. Scatterplots and regression b. Correlation coefficient and the residual c. Coefficient of determination and RMSE (root mean square error) d. Chi-square tests

Name *

Class *

IF 19 B

NPM *

There appears to be a strong, positive, linear relationship between sea surface temperatures and time. There appears to be a strong, negative, linear relationship between sea surface temperatures and time. There appears to be a weak, positive, linear relationship between sea surface temperatures and time. There appears to be a weak, negative, linear relationship between sea surface temperatures and time.

∑xy = 522

1. Based on the scatterplot, which choice best explains the trend in the data?

2. Use the table to find the sum. ∑xy

Figure 1 Figure 2

Figure 3 Figure 4

4. Which scatterplot has a correlation coefficient closest to −1?

5. The line of best fit for a data set is given by y = 2.0929x −0.4429. What’s the

value for the residual of the point (6,12)?

An R-value close to 1 or −1 means the line of best fit is perfect at making predictions from your data, you do not need any other checks. Always draw a scatterplot of your data points first before you perform a linear regression to get an idea of the shape of the data. When you check the residual plot, it needs to be in a random pattern with points above and below 0 in order for the line of best fit to be a good predictor of the data. The value of a data point is always equal to the value from the linear model, plus the residual value.

... the model is probably a good fit. ... the model is probably a bad fit. ... the r2 value will decrease.

6. Which statement is false?

7. If the correlation coefficient of a data set is r = 0.92, what percent of the

variation in y can be explained by the x-values?

8. When you calculate the RMSE, a smaller RMSE means that ...

The university can’t use a chi-square test because their sample doesn’t meet the independence condition

Ordering an appetizer doesn’t affect the dessert order Ordering an appetizer affects the dessert order The restaurant can’t use a chi-square test because their sample doesn’t meet the large counts condition The restaurant can’t use a chi-square test because their sample doesn’t meet the independence condition

11. A restaurant wants to know whether a diner’s choice to order dessert is

affected by whether or not they ordered an appetizer. On an evening when they

served 2,000 diners, they randomly sampled diners as they finished their meals,

and recorded whether they had ordered an appetizer and/or dessert. What can

the restaurant conclude using a chi-square test at 95 % confidence?

Sick days taken is not affected by quarter Sick days taken is affected by quarter The company can’t use a chi-square test because their sample doesn’t meet the large counts condition The company can’t use a chi-square test because their sample doesn’t meet the independence condition

This form was created inside of Universitas Teknokrat Indonesia.

12. A company wants to know if the number of sick days taken by its employees

is affected by quarter. They recorded sick days taken each quarter. What can the

company conclude using a chi-square test at 95 % confidence?

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