Chapter 10.2, Problem 10P

For Problems 5–16, please provide the following information.

1. (a) What is the level of significance? State the null and alternate hypotheses.
2. (b) Find the value of the chi-square statistic for the sample. Are all the expected frequencies greater than 5? What sampling distribution will you use? What are the degrees of freedom?
3. (c) Find or estimate the P-value of the sample test statistic.
4. (d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis that the population fits the specified distribution of categories?
5. (e) Interpret your conclusion in the context of the application.

Meteorology: Normal Distribution Let x be a random variable that represents the average daily temperature (in degrees Fahrenheit) in January for the town of Hana, Maui. The x variable has a mean μ of approximately 68ºF and standard deviation s of approximately 4ºF (see reference in Problem 9). A 20-year study (620 January days) gave the entries in the rightmost column of the following table.

1. (i) Remember that μ = 68 and σ = 4. Examine Figure 6-5 in Chapter 6. Write a brief explanation for Columns I, II, and III in the context of this problem.
2. (ii) Use a 1% level of significance to test the claim that the average daily January temperature follows a normal distribution with μ = 68 and σ = 4.