Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 36

Provide the following information
(a) What is the level of significance State the null and alternate hypotheses.
(b) Check Requirements What sampling distribution will you use Do you think the sample size is sufficiently large Explain. Compute the value of the sample test statistic.
(c) Find the P -value of the test statistic. Sketch the sampling distribution and show the area corresponding to P -value.
(d) Based on your answer in part (a) to (c), will you reject or fail to reject the null hypothesis Are the data statistically significant at level
(e) Interpret your conclusion in the context of the application.
Supermarket: Prices Harper's index reported that 80% of all supermarket prices end in the digit 9 or 5. Suppose you check a random sample of 115 items in a supermarket and find that 88 have prices that end in 9 or 5. Does this indicate that less than 80% of the prices in the store end up in digits 9 or 5 Use = 0.05.