STAT 200

In a survey, students are asked how many hours they study in a typical week. A five-number summary of the response is: 2, 9, 14, 20, 60. Which interval describes the number of hours spent studying in as typical week for about 50% of the students sampled? A. 9 to 20 B. 14 to 20 C. 9 to 14 D. 2 to 9

A. 9 to 20

Which statistic is NOT resistant to an outlier in the data? A. Mean B. Lower quartile C. Median D. Upper quartile

A. Mean

The equation of a regression line is called the regression equation. A. True B. Falsse

A. True

The simple linear regression equation can be written as y-hat =b0 + b1x In the simple linear regression equation, the term b0 represents the... A. estimated or predicted response B. estimated intercept C. explanatory variable D. estimated slope

B. estimated intercept

A five-number summary given in Case Study 1.1 for the fastest ever driving speeds reported by 102 women was: 30,80, 89, 95, and 130. Fill in the blank in the following sentence: Approx. 25% of the women reported a fastest ever driving speed of at least _____ mph. A. 25 B. 89 C. 95 D. 80

C. 95

Two variables have a positive association when... A. the values of one variable tend to decrease as the values of the other variable increase B. the values of both variables are always positive C. the values of one variable tend to increase as the values of the other variable increase D. the values of one variable tend to increase regardless of how the values of the other variable change

C. the values of one variable tend to increase as the values of the other variable increase

In a survey, ,students are asked how many hours they study in a typical week. A five-number summary of the response is: 2, 9, 14, 20, 60. Fill in the blank in the following sentence. About 75% of the students spent at least ___ hours studying in a typical week. A. 20 B. 45 C. 14 D. 9

D. 9

The correlation between two variables is given by r=0.0. What does this mean? A. There is a perfect negative relationship between the two variables. B. All of the points must fall exactly on a horizontal straight line. C. There is a perfect positive relationship between the two variables. D. The best straight line through the data is horizontal.

D. The best straight line through the data is horizontal.

Which one of the following statements is most correct about a skewed dataset? A. The mean and median will usually be the same. B. Whether the mean and median are the same depends on whether the data set is skewed to the right or to the left. C. The mean will always be higher than the median. D. The mean and median will usually be different.

D. The mean and median will usually be different.

The relative risk of a disease for group 1 compared to group 2 is close to the odds ration under which of these circumstances? A. When the numbers with the disease in each group are almost equal to the total in each group. B. The relative risk and the odds ration are never close to each other. C. When the numbers with the disease in each group are small compared to the total in each group D. When the numbers with the disease are about equal to the numbers without the disease in each group

D. When the numbers with the disease are about equal to the numbers without the disease in each group

The simple linear regression equation can be written as y-hat = b0 { b1x. In the simple linear regression equation, the symbol y-hat represents the... A. estimated intercept B. estimated slope C. explanatory variable D. average or predicted response

D. average or predicted response

What is the proper notation for the mean of a sample?

x bar