Gosset used the following data set, which gives the additional sleep in hours obtained by a sample of 10 patients  using laevo-hysocyamine hydrobromide.                                                    1.9, 0.8, 1.1, 0.1, −0.1, 4.4, 5.5, 1.6, 4.6, 3.4 a). Obtain and interpret a 95% confidence interval for the addi- tional sleep that would be obtained on average for all people using laevohysocyamine hydrobromide.  b). Was the drug effective in increasing sleep? Explain your answer.

A simple random sample of 5 observations from a normal distribution was taken, and the following values were obtained: {15, 19, 19, 20, 22}. A 95% confidence interval for the mean is O A. (16.569, 21.431) O B. (15.835, 22.165) O C.(16.069, 21.931) O D. (17.124, 20.876) O E. (16.765, 21.235)

Here are summary statistics for randomly selected weights of newborn girls: n = 36, x=3211.1 g, s= 689.4 g. Use a confidence level of 90% to complete parts (a) through (d) below.

A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 33 students' scores on the exam after completing the course: −6,11,18−6,11,18 Using these data, construct a 90%90% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal. Copy Data Step 4 of 4 :   Construct the 90%90% confidence interval. Round your answer to one decimal place.

In a sample of seven cars, each car was tested for nitrogen oxide emissions (in grams per mile). The results appear below. Assuming that nitrogen oxide emissions are normally distributed, 4. Car 1 2 3 4 5 6 7 Nitrogen oxide emission (g/mi) 0.13 0.18 0.15 0.09 0.12 0.18 0.08 a. Construct a 95% confidence interval for the mean amount of nitrogen oxide emissions for all cars. b. What effect would increasing the level of confidence have on the length of the interval?

Here are the alcohol percentages for a sample of 16 beers (light beers excluded): 4.69, 4.76, 4.25, 4.49, 5.08, 5.32, 6.44, 6.68, 5.05, 4.76, 5.15, 4.17, 6.51, 6.8, 6.35, 5.1 Calculate 8: ( Find a 95% confidence interval for the population variance, o². <0² <

A study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not.  The data are shown below. Generate a 95% confidence interval for the difference in mean HDL levels between men who exercise regularly and those who do not. b. Compute and interpret Sp?     Regular Exercise N Mean Std Dev   Yes 35 48.5 12.5   No 120 56.9 11.9             a.  95% CI (   ,    )                         b. Sp=       SP Interpretation

Suppose that you want to compare the means of several treatments in a randomized block ANOVA. If given the choice between using the randomized block ANOVA test and the Friedman test, which one would you choose if outliers occur in the sample data? Explain your answer.