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One cable company claims that it has excellent customer service. In...
One cable company claims that it has excellent customer service. In fact, the company advertises that...
One cable company claims that it has excellent customer service. In fact, the company advertises that a technician will arrive within 35 minu a service call is placed. One frustrated customer believes this is not accurate, claiming that it takes over 35 minutes for the cable technician The customer asks a simple random sample of 4 other cable customers how long it has taken for the cable technician to arrive when they ha for one. The sample mean for this...
Hypothesis Testing for Population Means When the Population Standard Deviation is NOT known. Use the t-distribution...
Hypothesis Testing for Population Means When the Population Standard Deviation is NOT known. Use the t-distribution tables One cable company claims that it has excellent customer service. In fact, the company advertises that a technician will arrive within 30 minutes after a service call is placed. One frustrated customer believes this is not accurate, claiming that it takes over 30 minutes for a cable technician to arrive. The customer asks a simple random sample of 9 other cable customers how...
Question 7 An online tutoring service claims that students who take their ACT preparation course have...
Question 7 An online tutoring service claims that students who take their ACT preparation course have a mean ACT score of at least 25.8. A consumer advocate is suspicious of this claim. The advocate polls 32 students who used the service. The students in the sample had a mean ACT score of 24.9, with a standard deviation of 3.8. Test for evidence that the mean ACT score for people using this service is actually lower than 25.8. Use a level...
00:55:16 A wedding website states that the average cost of a wedding is $29,205. One concerned...
00:55:16 A wedding website states that the average cost of a wedding is $29,205. One concerned bride hopes that the average is less than reported. To see if her hope is correct, she surveys 36 recently married couples and finds that the average cost of weddings in the sample was $27,338. Assuming that the population standard deviation is $4532, is there sufficient evidence to support the bride's hope at the 0.02 level of significance? Step 3 of 3: Draw a...
A steel company is considering the relocation of one of its manufacturing plants. The company's executives...
A steel company is considering the relocation of one of its manufacturing plants. The company's executives have selected four areas that they believe are suitable locations. However, they want to determine if the average wages are significantly different in any of the locations, since this could have a major impact on the cost of production. A survey of hourly wages of similar workers in each of the four areas is performed with the following results. Do the data indicate a...
Women athletes at the a certain university have a long-term graduation rate of 67%. Over the...
Women athletes at the a certain university have a long-term
graduation rate of 67%. Over the past several years, a random
sample of 37 women athletes at the school showed that 23 eventually
graduated. Does this indicate that the population proportion of
women athletes who graduate from the university is now less than
67%? Use a 10% level of significance.
(a) What is the level of significance?
State the null and alternate hypotheses.
H0: p = 0.67;
H1: p >...
A random sample of n1 = 16 communities in western Kansas gave the following information for peopl...
A random sample of n1 = 16 communities in western Kansas gave the following information for people under 25 years of age. x1: Rate of hay fever per 1000 population for people under 25 98 92 119 127 93 123 112 93 125 95 125 117 97 122 127 88 A random sample of n2 = 14 regions in western Kansas gave the following information for people over 50 years old. x2: Rate of hay fever per 1000 population for...
For one binomial experiment, n1 = 75 binomial trials produced r1 = 60 successes. For a...
For one binomial experiment, n1 = 75 binomial trials produced r1 = 60 successes. For a second independent binomial experiment, n2 = 100 binomial trials produced r2 = 85 successes. At the 5% level of significance, test the claim that the probabilities of success for the two binomial experiments differ. (a) Compute the pooled probability of success for the two experiments. (Round your answer to three decimal places.) (b) Check Requirements: What distribution does the sample test statistic follow? Explain....
The Toylot company makes an electric train with a motor that it claims will draw an...
The Toylot company makes an electric train with a motor that it claims will draw an average of only 0.8 ampere (A) under a normal load. A sample of nine motors was tested, and it was found that the mean current was x = 1.38 A, with a sample standard deviation of s = 0.41 A. Do the data indicate that the Toylot claim of 0.8 A is too low? (Use a 1% level of significance.) What are we testing...
Big Rock Insurance Company did a study of per capita income and volume of insurance sales...
Big Rock Insurance Company did a study of per capita income and volume of insurance sales in eight Midwest cities. The volume of sales in each city was ranked, with 1 being the largest volume. The per capita income was rounded to the nearest thousand dollars. Reading 1 2 3 4 5 6 7 8 Rank of insurance sales volume 2 4 3 6 7 5 8 1 Per capita Income In $1000 19 17 18 14 12 13 15...
One cable company claims that it has excellent customer service. In fact, the company advertises that a technician will arrive within 35 minu a service call is placed. One frustrated customer believes this is not accurate, claiming that it takes over 35 minutes for the cable technician The customer asks a simple random sample of 4 other cable customers how long it has taken for the cable technician to arrive when they ha for one. The sample mean for this...
Question 7 An online tutoring service claims that students who take their ACT preparation course have a mean ACT score of at least 25.8. A consumer advocate is suspicious of this claim. The advocate polls 32 students who used the service. The students in the sample had a mean ACT score of 24.9, with a standard deviation of 3.8. Test for evidence that the mean ACT score for people using this service is actually lower than 25.8. Use a level...
00:55:16 A wedding website states that the average cost of a wedding is $29,205. One concerned bride hopes that the average is less than reported. To see if her hope is correct, she surveys 36 recently married couples and finds that the average cost of weddings in the sample was $27,338. Assuming that the population standard deviation is $4532, is there sufficient evidence to support the bride's hope at the 0.02 level of significance? Step 3 of 3: Draw a...
A steel company is considering the relocation of one of its manufacturing plants. The company's executives have selected four areas that they believe are suitable locations. However, they want to determine if the average wages are significantly different in any of the locations, since this could have a major impact on the cost of production. A survey of hourly wages of similar workers in each of the four areas is performed with the following results. Do the data indicate a...
Women athletes at the a certain university have a long-term
graduation rate of 67%. Over the past several years, a random
sample of 37 women athletes at the school showed that 23 eventually
graduated. Does this indicate that the population proportion of
women athletes who graduate from the university is now less than
67%? Use a 10% level of significance.
(a) What is the level of significance?
State the null and alternate hypotheses.
H0: p = 0.67;
H1: p >...
Big Rock Insurance Company did a study of per capita income and volume of insurance sales in eight Midwest cities. The volume of sales in each city was ranked, with 1 being the largest volume. The per capita income was rounded to the nearest thousand dollars. Reading 1 2 3 4 5 6 7 8 Rank of insurance sales volume 2 4 3 6 7 5 8 1 Per capita Income In $1000 19 17 18 14 12 13 15...
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