Reference no: EM132169831

Assignment -

Cardiac Deaths Launch Minitab Because cardiac death appears to increase after heavy snowfalls, an experiment was designed to compare cardiac demands of snow shoveling to those of using an electric snow thrower. Ten subjects cleared tracts of snow using both methods and their heart rates (beats per minute) were recorded during both activities. The following summary results were obtained: Manual Snow Shoveling Maximum Heart Rates: n = 10 Mean = 175 Standard Deviation = 15 Electric Snow Throwing Maximum Heart Rates: n = 10 Mean = 124 Standard Deviation = 18

a) Find the 95% confidence interval estimate of the population mean each group. Include the Minitab Printout.

b) Compare the results. Is there truly a difference in the heart rates?

c) Explain in your own words what a 95% confidence interval represents in relationship to this data. Coke Volume Data Randomly selected cans of Coke are measured to find the amount of cola in ounces. The data is provided in the attached file. We want to test the claim that cans of coke have a mean amount of cola not equal to 12 ounces at the 0.05 level of significance.

a) State the null and alternate hypothesis using correct symbolization.

b) Complete the test and include a copy of the Minitab Printout for this test.

c) Give the mean and the standard deviation.

d) Give the standardized score ("T").

e) Give the p-value.

f) Based on the p-value, give your conclusion to this test and explain your reasoning.

Chips Ahoy (from ActivStats Homework) Data In 1998, as an advertising campaign, the Nabisco Company announced a "1000 Chips Challenge," claiming that every 18-ounce bag of their Chips Ahoy cookies contained at least 1000 chocolate chips. Dedicated Statistics students purchased some randomly selected bags of cookies and counted the chocolate chips. (Chance 12, no. 1 [1999]). The data is attached.

a) Check the assumptions and conditions for inference: independence, randomization, normality (include a histogram).

b) Comment on any concerns you may have about the data.

c) Create a 95% confidence interval for the mean number of chips in bags of Chips Ahoy Cookies. Include the Minitab Printout for the confidence interval.

d) Test to determine if the mean number of chips for the population is at least 1000 chocolate chips. Include the Minitab Printout for the test.

e) Looking at both the confidence interval and the p-value from the test, what can you say about the mean number of chips? Do you reject or fail to reject Ho? Why? (significance = .05)

f) Test the claim that each bag contains at least 1000 chocolate chips.