Homework Answers
The right answer is b. P-value is used to determine whether the observed mean (25.2) is equal to the assumed mean (23.3). In this case, it states that if the mean is 23.3 years, then the probability of observing the mean at 25.2 years or higher with our sample (N=40, S.D. = 5.3 years) is 1.45%
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D Question 25 4 pts The average age of online consumers a few years ago was...
Several years ago, the mean height of women 20 years of age or older was 63.7...
Several years ago, the mean height of women 20 years of age or older was 63.7 inches. Suppose that a random sample of 45 women who are 20 years of age or older today results in a mean height of 63.9 inches. (a) State the appropriate null and alternative hypotheses to assess whether women are taller today (b) Suppose the P-value for this test is 0.12. Explain what this value represents. (C) Write a conclusion for this hypothesis test assuming...
Several years ago, the mean height of women 20 years of age or older was 63.7...
Several years ago, the mean height of women 20 years of age or older was 63.7 inches. Suppose that a random sample of 45 women who are 20 years of age or older today results in a mean height of 64.5 inches (a) State the appropriate null and alternative hypotheses to assess whether women are taller today (b) Suppose the P value for this testis 0.02. Explain what this value represents (c) Write a conclusion for this hypothesis foot assuming...
Several years ago, the mean height of women 20 years of age or older was 63.7...
Several years ago, the mean height of women 20 years of age or older was 63.7 inches. Suppose that a random sample of 45 women who are 20 years of age or older today results in a mean height of 64.6 inches. (a) State the appropriate null and alternative hypotheses to assess whether women are taller today. (b) Suppose the P-value for this test is 0.18. Explain what this value represents. (c) Write a conclusion for this hypothesis test assuming...
3. Age of runners. The average of the runners’ ages is µ = 34.05 years with...
3. Age of runners. The average of the runners’ ages is µ = 34.05 years with a standard deviation of σ = 9.83. A simple random sample of 100 runners is taken. a. Find the standard deviation of the sample mean, σx. b. In your opinion, would you be surprised to get a sample (of size 100) with an average age of 36 years? Why or why not? (One idea: start by calculated this probability, the probability of getting an...
If a researcher believed that the average young adult (under age 30) carries less than $10...
If a researcher believed that the average young adult (under age 30) carries less than $10 in cash with them, then the Null Hypothesis for the hypothesis test should be: a) The mean is less than $10 b) The mean is not equal to $10 c) The mean is equal $10 d) The mean is at most $10 For a hypothesis test, a sample is gathered. The sample mean and P-value are found. What is the meaning of the P-value?...
Question 12 2.5 pts The average age of cars owned by residents of Oshkosh is 4...
Question 12 2.5 pts The average age of cars owned by residents of Oshkosh is 4 years with a standard deviation of 2.2 years. A simple random sample of 400 cars is selected, and the sample mean age is computed. What is the probability that the average age of the 400 cars is less than 3.8 years? 0.0344 0.5359 0.9656 0.4641
The average retirement age in America is 65 years old. Do small business owners retire at...
The average retirement age in America is 65 years old. Do small business owners retire at an older average age? The data below shows the results of a survey of small business owners who have recently retired. Assume that the distribution of the population is normal. 70, 74, 62, 61, 69, 63, 70, 68, 77, 58, 70, 70, 65, 63, 72, 75 What can be concluded at the the a = 0.10 level of significance level of significance? a. For...
the average age for teachers was 54 years. with younger teachers coming into the industry and...
the average age for teachers was 54 years. with younger teachers coming into the industry and getting promoted, human resources would like to determine the average age of senior staff is lower than before. sample size=61 sample mean= 50 standard deviation= 16 1) is this a one tailed or two tailed test? 2)what is the test statistic value? 3)the p-value is between? 4) if the test is done at 90%, 95% and 99% confidence levels, the null hypothesis should be...
D Question 9 9 pts The average age of all doctors is 42.0 years old with...
D Question 9 9 pts The average age of all doctors is 42.0 years old with a standard deviation of 11.0 years. If 16 doctors are chosen at random for a committee, find the probability that the mean age of those doctors is less than 43.50 years.
It is believed that the average age students is 26. Using a 0.05 level of significance,...
It is believed that the average age students is 26. Using a 0.05 level of significance, should the findings of the Class Survey support the belief that the average age is 26. The population standard deviation is 6.5. data set:(age) 31 30 21 20 44 43 23 25 30 28 19 21 21 37 26 20 19 22 28 40 20 48 19 20 36 20 20 19 19 21 47 19 21 19 17 19 20 20 32 23...
Several years ago, the mean height of women 20 years of age or older was 63.7 inches. Suppose that a random sample of 45 women who are 20 years of age or older today results in a mean height of 63.9 inches. (a) State the appropriate null and alternative hypotheses to assess whether women are taller today (b) Suppose the P-value for this test is 0.12. Explain what this value represents. (C) Write a conclusion for this hypothesis test assuming...
Several years ago, the mean height of women 20 years of age or older was 63.7 inches. Suppose that a random sample of 45 women who are 20 years of age or older today results in a mean height of 64.5 inches (a) State the appropriate null and alternative hypotheses to assess whether women are taller today (b) Suppose the P value for this testis 0.02. Explain what this value represents (c) Write a conclusion for this hypothesis foot assuming...
If a researcher believed that the average young adult (under age 30) carries less than $10 in cash with them, then the Null Hypothesis for the hypothesis test should be: a) The mean is less than $10 b) The mean is not equal to $10 c) The mean is equal $10 d) The mean is at most $10 For a hypothesis test, a sample is gathered. The sample mean and P-value are found. What is the meaning of the P-value?...
Question 12 2.5 pts The average age of cars owned by residents of Oshkosh is 4 years with a standard deviation of 2.2 years. A simple random sample of 400 cars is selected, and the sample mean age is computed. What is the probability that the average age of the 400 cars is less than 3.8 years? 0.0344 0.5359 0.9656 0.4641
The average retirement age in America is 65 years old. Do small business owners retire at an older average age? The data below shows the results of a survey of small business owners who have recently retired. Assume that the distribution of the population is normal. 70, 74, 62, 61, 69, 63, 70, 68, 77, 58, 70, 70, 65, 63, 72, 75 What can be concluded at the the a = 0.10 level of significance level of significance? a. For...
D Question 9 9 pts The average age of all doctors is 42.0 years old with a standard deviation of 11.0 years. If 16 doctors are chosen at random for a committee, find the probability that the mean age of those doctors is less than 43.50 years.
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