worksheet1-blank.pdf

# This means that the distribution of survival times is

• Homework Help
• 4

This preview shows pages 2–4. Sign up to view the full content.

This means that the distribution of survival times is most likely a) left-skewed b) right-skewed c) symmetric d) unimodal e) none of these 16. If a distribution is strongly skewed, then the most appropriate numerical summary of the distribution is a) the two-number summary b) the five-number summary c) the correlation coefficient d) the χ 2 -statistic e) none of these σ x )

This preview has intentionally blurred sections. Sign up to view the full version.

17. The P -value for a hypothesis test is P = 0.375. At which of the following significance levels would we reject the null hypothesis? a) α = 10% b) α = 5% c) α = 1% d) α = 0.1% e) none of these 18. The 92% confidence interval for a population mean μ is (13, 19). In a hypothesis test of H 0 : μ = 17 versus H a : μ 17 at the α = 8% significance level, we would a) accept H 0 b) reject H 0 c) accept H a d) impossible to say e) none of these Use the following scenario for problems 19 through 21 . For a biology project, you measure the weight in grams and the tail length in millimeters (mm) of a group of mice. You then use this data to find the least- squares regression line for predicting tail length from weight: 19. What tail length would you predict for a mouse that weighs 50 grams? a) 20 mm b) 10 mm c) 150 mm d) 170 mm e) none of these 20. How much on average does tail length increase for each additional gram of weight? a) 3 mm b) 20 mm c) 23 mm d) 1/3 mm e) none of these 21. The correlation coefficient between weight and tail length is r = 0.80. What fraction of the variation in tail length is explained by the least squares regression onto weight? a) 0.80 b) 0.64 c) 0.20 d) 0.36 e) none of these Use the following scenario for questions 22 through 24 . Below is a histogram of light bulb lifetimes from a simple random sample of 30 bulbs taken from an assembly line. Note that the vertical axis is given in counts (i.e. number of bulbs). Assume that no data point fell exactly on a class (i.e. bin) boundary. 22. Circle all words below that describe the shape of the distribution of light bulb lifetimes unimodal bimodal uniform symmetric left-skewed right-skewed 23. What percent of light bulbs in the sample lasted less than 1100 hours?
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern