Homework Answers
Test concerning Population Proportion
Answer 1) relevant point estimate is value of sample proportion = 22/100 =. 22
Answer 2)
Test statistic :
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8. Hypothesis testing, problem 4 Aa Aa Microsoft Outlook is believed to be the most widely...
8. Hypothesis testing, problem 4 Aa Aa Microsoft Outlook is believed to be the most widely used e-mail manager. A Microsoft executive claims that Outlook is used by at least 75% of Internet users. A Merrill Lynch study involving 200 respondents reported that 68% use Microsoft Outlook. Can you prove that the executive's claim is not valid? What is the relevant point estimate? What is the value of the test statistic? This test statistic has: O A t distribution with...
please help me check the answer, thank you! ：:) Microsoft Outlook is believed to be the...
please help me check the answer, thank you! ：:)
Microsoft Outlook is believed to be the most widely used e-mail manager. A Microsoft executive claims that Outlook is used by at least 75% of Internet users. A Merill Lynch study involving 300 respondents reported that 72% use Microsoft Outlook. Can you prove that the executive's claim is not valid? What is the relevant point estimate? 0.72 What is the value of the test statistic? -1.2000 This test statistic has: A...
The owners of Johnny Jim's claim that their stores average $875,000 in annual sales. You used...
The owners of Johnny Jim's claim that their stores average $875,000 in annual sales. You used this information in deciding to open a store. Your store however has not come even close to these annual sales. You want to prove that the figures given to you were misleading, and that in fact the true population sales figures must be below $875,000 You collect annual sales figures from 55 randomly selected stores. The average in your sample turns out to be...
Your company is considering opening a retail store in Fairbanks, Alaska, but will do so only...
Your company is considering opening a retail store in Fairbanks, Alaska, but will do so only if average daily spending per capita is higher there than in the rest of the country. According to recent data, the average U.S. household spends $80 per day. A sample was taken in Fairbanks. From a sample of 123, the average daily expenditure was $79.10, and the standard deviation was $9.80 What is the relevant point estimate? What is the value of the test...
In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smalier....
In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smalier. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. At five weather stations on Trail Ridge Road in Rocky Mountain National Park, the peak wind gusts (in miles per hour) for January and April are...
The choices are listed in the screen shot below the questions. Only answer is needed, solving...
The choices are listed in the screen shot below the
questions. Only answer is needed, solving steps are not required.
Thank you!
The returns of two portfolios were recorded for fourteen years. Portfolio 1 had a variance of returns of 155, while portfolio 2 had a variance of 99. Can you conclude at a 5% level of significance that portfolio 1 is riskier (has a higher variance) than portfolio 2? The test statistic for testing this claim will have the...
Given X, and x, distributions that are normal or approximately normal with unknown o, and on,...
Given X, and x, distributions that are normal or approximately normal with unknown o, and on, the value of t corresponding to X, - X, has a distribution that is approximated by a Student's t distribution. We use the convention that the degrees of freedom is approximately the smaller of n - 1 and n, - 1. However, a more accurate estimate for the appropriate degrees of freedom is given by Satterthwaite's formula: 2 2 xn2 522 +$22) d.f. z...
For a random sample of 36 data pairs, the sample mean of the differences was 0.72....
For a random sample of 36 data pairs, the sample mean of the differences was 0.72. The sample standard deviation of the differences was 2. At the 5% level of significance, test the claim that the population mean of the differences is different from 0. (a) Is it appropriate to use a Student's t distribution for the sample test statistic? Explain. No, the sample size is not larger than 30. Yes, the sample size is larger than 30. No, the...
A random sample of 16 values is drawn from a mound-shaped and symmetric distribution. The sample...
A random sample of 16 values is drawn from a mound-shaped and symmetric distribution. The sample mean is 15 and the sample standard deviation is 2. Use a level of significance of 0.05 to conduct a two-tailed test of the claim that the population mean is 14.5. (a) Is it appropriate to use a Student's t distribution? Explain. Yes, because the x distribution is mound-shaped and symmetric and σ is unknown.No, the x distribution is skewed left. No, the x distribution...
You may need to use the appropriate technology to answer this question. Consider the following hypothesis...
You may need to use the appropriate technology to answer this question. Consider the following hypothesis test. The following results are from independent samples taken from two populations assuming the variances are unequal Sample 1 Sample 2 n1-352 x1-13.6x2-10.1 s, 5.5 s = 8.1 n2-40 (a) What is the value of the test statistic? (Use X1-x2. Round your answer to three decimal places.) (b) What is the degrees of freedom for the t distribution? (Round your answer down to the...
8. Hypothesis testing, problem 4 Aa Aa Microsoft Outlook is believed to be the most widely used e-mail manager. A Microsoft executive claims that Outlook is used by at least 75% of Internet users. A Merrill Lynch study involving 200 respondents reported that 68% use Microsoft Outlook. Can you prove that the executive's claim is not valid? What is the relevant point estimate? What is the value of the test statistic? This test statistic has: O A t distribution with...
please help me check the answer, thank you! ：:)
Microsoft Outlook is believed to be the most widely used e-mail manager. A Microsoft executive claims that Outlook is used by at least 75% of Internet users. A Merill Lynch study involving 300 respondents reported that 72% use Microsoft Outlook. Can you prove that the executive's claim is not valid? What is the relevant point estimate? 0.72 What is the value of the test statistic? -1.2000 This test statistic has: A...
The owners of Johnny Jim's claim that their stores average $875,000 in annual sales. You used this information in deciding to open a store. Your store however has not come even close to these annual sales. You want to prove that the figures given to you were misleading, and that in fact the true population sales figures must be below $875,000 You collect annual sales figures from 55 randomly selected stores. The average in your sample turns out to be...
Your company is considering opening a retail store in Fairbanks, Alaska, but will do so only if average daily spending per capita is higher there than in the rest of the country. According to recent data, the average U.S. household spends $80 per day. A sample was taken in Fairbanks. From a sample of 123, the average daily expenditure was $79.10, and the standard deviation was $9.80 What is the relevant point estimate? What is the value of the test...
In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smalier. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. At five weather stations on Trail Ridge Road in Rocky Mountain National Park, the peak wind gusts (in miles per hour) for January and April are...
The choices are listed in the screen shot below the
questions. Only answer is needed, solving steps are not required.
Thank you!
The returns of two portfolios were recorded for fourteen years. Portfolio 1 had a variance of returns of 155, while portfolio 2 had a variance of 99. Can you conclude at a 5% level of significance that portfolio 1 is riskier (has a higher variance) than portfolio 2? The test statistic for testing this claim will have the...
Given X, and x, distributions that are normal or approximately normal with unknown o, and on, the value of t corresponding to X, - X, has a distribution that is approximated by a Student's t distribution. We use the convention that the degrees of freedom is approximately the smaller of n - 1 and n, - 1. However, a more accurate estimate for the appropriate degrees of freedom is given by Satterthwaite's formula: 2 2 xn2 522 +$22) d.f. z...
For a random sample of 36 data pairs, the sample mean of the differences was 0.72. The sample standard deviation of the differences was 2. At the 5% level of significance, test the claim that the population mean of the differences is different from 0. (a) Is it appropriate to use a Student's t distribution for the sample test statistic? Explain. No, the sample size is not larger than 30. Yes, the sample size is larger than 30. No, the...
You may need to use the appropriate technology to answer this question. Consider the following hypothesis test. The following results are from independent samples taken from two populations assuming the variances are unequal Sample 1 Sample 2 n1-352 x1-13.6x2-10.1 s, 5.5 s = 8.1 n2-40 (a) What is the value of the test statistic? (Use X1-x2. Round your answer to three decimal places.) (b) What is the degrees of freedom for the t distribution? (Round your answer down to the...
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