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A personnel director in a particular state claims that the mean annual income is the same in one of the state's counties (County A) as it is in another county (County B). In County A, a random sample of 18 residents has a mean annual income of $41,300 and a standard deviation of $8700. In County B, a random sample of 8 residents has a mean annual income of $38,600 and a standard deviation of $5600. At a = 0.10, answer parts (a) through (e). Assume the population variances are not equal. Assume the samples are random and independent, and the populations are normally distributed. (a) Identify the claim and state H, and Ha. Which is the correct claim below? O A. "The mean annual income in County A is greater than in County B." B. "The mean annual income in County A is less than County B." c. "The mean annual incomes in Counties A and B are equal." O D. "The mean annual incomes in Counties A and B are not equal." What are H, and H,? The null hypothesis, Ho, is µ1 = H2. The alternative hypothesis, Ha, is µ1 # H2. Which hypothesis is the claim? * The null hypothesis, Ho X The alternative hypothesis, Ha (b) Find the critical value(s) and identify the rejection region(s). Enter the critical value(s) below.

A personnel director in a particular state claims that the mean annual income is the same in one of the state's counties (County A) as it is in another county (County B). In County A, a random sample of 18 residents has a mean annual income of $41,300 and a standard deviation of $8700. In County B, a random sample of 8 residents has a mean annual income of $38,600 and a standard deviation of $5600. At a = 0.10, answer parts (a) through (e). Assume the population variances are not equal. Assume the samples are random and independent, and the populations are normally distributed. (a) Identify the claim and state H, and Ha. Which is the correct claim below? O A. "The mean annual income in County A is greater than in County B." B. "The mean annual income in County A is less than County B." c. "The mean annual incomes in Counties A and B are equal." O D. "The mean annual incomes in Counties A and B are not equal." What are H, and H,? The null hypothesis, Ho, is µ1 = H2. The alternative hypothesis, Ha, is µ1 # H2. Which hypothesis is the claim? * The null hypothesis, Ho X The alternative hypothesis, Ha (b) Find the critical value(s) and identify the rejection region(s). Enter the critical value(s) below.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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A personnel director in a particular state claims that the mean annual income is the same in one of the state's counties (County A) as it is in another county (County B). In County A, a random sample of 18 residents has a mean annual income of $41,300 and a standard deviation of $8700. In County B, a random sample of 8 residents has a mean annual income of $38,600 and a standard deviation of $5600. At a = 0.10, answer parts (a) through (e). Assume the population variances are not equal. Assume the samples are random and independent, and the populations are normally distributed. (a) Identify the claim and state H, and Ha. Which is the correct claim below? A. "The mean annual income in County A is greater than in County B." B. "The mean annual income in County A is less than in County B." C. "The mean annual incomes in Counties A and B are equal." "The mean annual incomes in Counties A and B are not equal." What are Ho and H,? The null hypothesis, Ho, is µ1 = µ2. The alternative hypothesis, Ha, is µ, + µ2. Which hypothesis is the claim? The null hypothesis, Ho The alternative hypothesis, Ha (b) Find the critical value(s) and identify the rejection region(s). Enter the critical value(s) below. (Type an integer or decimal rounded to three decimal places as needed. Use a comma to separate answers as needed.)
Transcribed Image Text:A personnel director in a particular state claims that the mean annual income is the same in one of the state's counties (County A) as it is in another county (County B). In County A, a random sample of 18 residents has a mean annual income of $41,300 and a standard deviation of $8700. In County B, a random sample of 8 residents has a mean annual income of $38,600 and a standard deviation of $5600. At a = 0.10, answer parts (a) through (e). Assume the population variances are not equal. Assume the samples are random and independent, and the populations are normally distributed. (a) Identify the claim and state H, and Ha. Which is the correct claim below? A. "The mean annual income in County A is greater than in County B." B. "The mean annual income in County A is less than in County B." C. "The mean annual incomes in Counties A and B are equal." "The mean annual incomes in Counties A and B are not equal." What are Ho and H,? The null hypothesis, Ho, is µ1 = µ2. The alternative hypothesis, Ha, is µ, + µ2. Which hypothesis is the claim? The null hypothesis, Ho The alternative hypothesis, Ha (b) Find the critical value(s) and identify the rejection region(s). Enter the critical value(s) below. (Type an integer or decimal rounded to three decimal places as needed. Use a comma to separate answers as needed.)
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