A large sample size is needed to show significance in a test of two population standard deviation. O True O False
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Q: Moviegoers The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who…
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Q: An electrician wants to know whether batteries made by two manufacturers have significantly…
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Q: The mean voltage and standard deviation of 13 batteries from each manufacturer were measured. The…
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Q: An electrician wants to know whether batteries made by two manufacturers have significantly…
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Q: An electrician wants to know whether batteries made by two manufacturers have significantly…
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Q: The mean voltage and standard deviation of 8 batteries from each manufacturer were measured. The…
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Q: Moviegoers The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who…
A: Given Xbar=9.1 , sigma=3.2 , n=47 Alpha=0.10 H0:mu=8.5 Vs H1:mu≠8.5 Critical value=-1.645 to…
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- Moviegoers The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who sees at least one movie in a theater in a 12-month period.A random sample of 42 moviegoers from a large university revealed that the average number of movies seen per person was 9.6. The population standard deviation is 3.2 movies. At the 0.10 level of significance, can it be concluded that this represents a difference from the national average? (a)State the hypotheses and identify the claim with the correct hypothesis. (b)Find the critical value(s). (c)Compute the test value. (d)Make the decision. (e)Summarize the results.A recent study focused on the amount of money single men and women save monthly. The information is summarized here. Assume that the population standard deviations are unknown but equal. Sample Size Sample Mean Sample Standard Deviation Men 25 50 10 Women 30 54 5 At the 0.01 significance level, do women save more money than men? What is the value of the test statistic for this hypothesis test? Multiple Choice +1.819 +2.326 +1.924 +2.399five samples of 15 minerals are taken from a population. The sample means for hardness of the minerals are 6.5, seven, seven, 6.5, and six. The standard deviation for the mineral is .745. Find the meaning of the sample means and the standard deviation of the sample means for the hardness
- A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.92 years and the standard deviation is 10.19 years. a) What is the standard error of the mean? b) How would the standard error change if the sample size had been 400 instead of 25? (Assume that the sample standard deviation didn't change.) 22 21 35 23 33 35 26 44 44 14 48 25 27 12 43 48 38 46 36 35 38 38 32 23 37 ... a) The standard error of the mean is (Round to two decimal places as needed.) b) How would the standard error change if the sample size was 400 instead of 25 with the same sample standard deviation? Select the correct choice below and fill in any answer boxes within your choice. O A. The standard error would increase. The new standard error would be times the old. B. The standard error would decrease. The new standard error would be the old standard error divided by O C. The standard error would not change.Moviegoers The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who sees at least one movie in a theater in a 12-month period. A random sample of 42 moviegoers from a large university revealed that the average number of movies seen per person was 10.2. The population standard deviation is 3.2 movies. At the 0.01 level of significance, can it be concluded that this represents a difference from the national average? Part 1 of 5 State the hypotheses and identify the claim with the correct hypothesis. Hotu = 85 Part: 1/5 not claim H₁ 8.5 claim This hypothesis test is a two-tailed ▼test. Part 2 of 5 ▼ ▼ Find the critical value(s). Round the answer to at least two decimal places. If there is more than one critical value, separate them with commas. Critical value(s): X 0.0.... + 8分民图〗b. EAn electrician wants to know whether batteries made by two manufacturers have significantly different voltages. The voltage of 131 batteries from each manufacturer were measured. The population standard deviations of the voltage for each manufacturer are known. The results are summarized in the following table. Manufacturer Sample mean voltage (millivolts) Population standard deviat A 116 3 115 4 What type of hypothesis test should be performed? Right-tailed z-test v What is the test statistic? Ex: 0.12 Does sufficient evidence exist to support the claim that the voltage of the batteries made by the two manufacturers is different at the a = 0.01 significance level? Select v
- The state of CT claims that the average time on death row is 15 years. A random survey of 75 death row inmates revealed that the average length of time on death row is 16.6 years with a standard deviation of 5.8 years. Conduct a hypothesis to test the state of CT's claim. t test mean two tail test p value = ____________ What is the decision?What are the values for SS and variance for the following sample of n = 3 scores? Sample: 8, 5, 20 123 ess is functioning properly. significance. 5 workers from one company But a general perception is 1 of significance mnle 6.32 Jeffery, a high school swimmer, swims the 25-yard freestyle with a mean time of 16.43 seconds without using goggles. After his father bought him goggles, Jeffery swam the 25-yard freestyle 15 times. After the 15 swims, Jeffery's mean time was 16 seconds and sample standard deviation was 2 seconds. His father thought the goggles helped Jeffery swim faster. Test his father's hypothesis using a 5% level of significance. Assume that the sample of measurements are from a normally distributed population. 6.30 suburb.
- 16 34 41 21 340 A survey of 25 randomly selected customers found the ages shown (in years). The mean is 31.64 years and the standard deviation is 9.62 years. a) What is the standard error of the mean? 38 43 26 43 20 b) How would the standard error change if the sample size had been 400 instead of 25? (Assume that the sample standard deviation didn't change.) 26 20 36 32 32 35 11 25 48 30 31 25 40 46 38 a) The standard error of the mean is (Round to two decimal places as needed.) b) How would the standard error change the sample size was 400 instead of 25 with the same sample standard deviation? Select the correct choice below and fill in any answer boxes within your choice. O A. The standard error would increase. The new standard error would be times the old, O B. The standard error would decrease. The new standard error would be the old standard error divided by O C. The standard error would not change.What is the Test Statistic and P-Value?Consider the data set. 2, 4, 5, 6, 9 (b) Use the defining formula to compute the sample standard deviation s. (Round your answer to two decimal places.)
