The mean attention span for adults in a certain village is 20 minutes with a standard deviation of 7.2. If many samples of size 25 are taken from that population, and a sampling distribution of their means is created, of that distribution will equal _
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- According to a leasing firm's reports, the mean number of miles driven annually in its leased cars is 12,660 miles with a standard deviation of 1040 miles. The company recently starting using new contracts which require customers to have the cars serviced at their own expense. The company's owner believes the mean number of miles driven annually under the new contracts, μ, is less than 12,660 miles. He takes a random sample of 70 cars under the new contracts. The cars in the sample had a mean of 12,635 annual miles driven. Is there support for the claim, at the 0.05 level of significance, that the population mean number of miles driven annually by cars under the new contracts, is less than 12,660 miles? Assume that the population standard deviation of miles driven annually was not affected by the change to the contracts. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified…According to a leasing firm's reports, the mean number of miles driven annually in its leased cars is 12,920 miles with a standard deviation of 2280 miles. The company recently starting using new contracts which require customers to have the cars serviced at their own expense. The company's owner believes the mean number of miles driven annually under the new contracts, u, is less than 12,920 miles. He takes a random sample of 80 cars under the new contracts. The cars in the sample had a mean of 12,842 annual miles driven. Is there support for the claim, at the 0.05 level of significance, that the population mean number of miles driven annually by cars under the new contracts, is less than 12,920 miles? Assume that the population standard deviation of miles driven annually was not affected by the change to the contracts. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified…The average elementary teacher’s salary in Recoletors Schools is 17,300. ₱Assume a normal distribution with standard deviation of 2530. What is the ₱probability that the mean for a sample of 36 teachers’ salaries is lesser than ₱16,500?
- Use the Student_Data which consists of 200 MBA students at Whatsamattu U. It includes variables regarding their age, gender, major, GPA, Bachelors GPA, course load, English speaking status, family, and weekly hours spent studying. Let's assume that the Student_Data.xls file was the entire population. We know the mean and standard deviation of student ages to be 42.3 and 8.9, respectively. Using the Normal_ Probability.xls file, compute the percentage of students that are older than 50, younger than 40, between 41 and 46, and oldest 10% are at what age? Then compare to the truth as found in the actual file. ID Gender Major Employ Age MBA_GPA BS GPA Hrs_Studying Works FT 1 1 No Major Unemployed 39 2.82 3.05 3 0 2 1 No Major Full Time 55 3.49 3.45 7 1 3 1 No Major Part Time 43 3.28 3.5 7 0 4 1 No Major Full Time 56 3.25 3.55 7 1 5 1 No Major Full Time 38 3.26 3.3 6 1 6 1 No Major Unemployed 54 2.87 3.05 4 0 7 1 No Major Full Time 30 3.16 3.35 6 1 8 1 No Major Full Time…A researcher believes that adolescents learn faster than elders. He gathered 30 adolescents and 23 elders for the test. He provided same instructional material that explains how to use Photoshop to retouch images and recorded the time that each participant took to finish their Photoshop task. The average time taken by the adolescents was 180 seconds with a standard deviation of 13 seconds. The mean time for elders was 279 seconds with a standard deviation of 25 seconds. A). Complete test statistic and critical values B). ConclusionAccording to a leasing firm's reports, the mean number of miles driven annually in its leased cars is 13,280 miles with a standard deviation of 2100 miles. The company recently starting using new contracts which require customers to have the cars serviced at their own expense. The company's owner believes the mean number of miles driven annually under the new contracts, µ, is less than 13,280 miles. He takes a random sample of 21 cars under the new contracts. The cars in the sample had a mean of 12,113 annual miles driven. Assume that the population is normally distributed. Is there support for the claim, at the 0.01 level of significance, that the population mean number of miles driven annually by cars under the new contracts, is less than 13,280 miles? Assume that the population standard deviation of miles driven annually was not affected by the change to the contracts. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more…
- A survey found that women`s heights are normally distributed with a mean of 62.7 inches and a standard deviation of 2.5 inches. The survey also found that men`s heights are normally distributed with a mean of 67.3 inches and a standard deviation of 3.1 inches. Most of the live characters employed at an amusement park have height requirements of a minimum of 56 inches. and a maximum of 63 inches. a) Find the percentage of men meeting the height requirement. Round to 2 decimal places if needed.The mean age when smokers first start is 13 years old with a population standard deviation of 1.8 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 35 smokers found that their mean starting age was 12.3 years old. Do the data support the- claim at the 5% significance level? What are the correct hypotheses? Ho: Select an answer e years H1: Select an answer e years Based on the hypotheses, find the following: Test Statistic z = (Round to 4 decimal places.) Critical Values = = (Round to 2 decimal places.) Based on the above we choose to Select an answer O that the mean age smokers The correct summary would be: Select an answer first start is different than 13.The Census Bureau reports that 82% of Americans over the age of 25 are high school graduates. A survey of randomly selected residents of certain county included 1100 who were over the age of 25, and 871 of them were high school graduates, (a) Find the mean and standard deviation for the number of high school graduates in groups of 1100 Americans over the age of 25. Mean = %3D Standard deviation = (b) Is that county result of 871 unusually high, or low, or neither? (Enter HIGH or LOW or NEITHER) Give your answers exactly, or to at least 4 decimal places.
- Many college graduates who are employed full-time have longer than 40-hour work weeks. Suppose that we wish to estimate the mean number of hours, μ, worked per week by college graduates employed full-time. We'll choose a random sample of college graduates employed full-time and use the mean of this sample to estimate μ. Assuming that the standard deviation of the number of hours worked by college graduates is 6.10 hours per week, what is the minimum sample size needed for us to be 95% confident that our estimate is within 1.5 hours per week of μ? Carry the intermediate computations to at least three decimal places. Compose the answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).According to a leasing firm's reports, the mean number of miles driven annually in its leased cars is 13,480 miles with a standard deviation of 1240 miles. The company recently starting using new contracts which require customers to have the cars serviced at their own expense. The company's owner believes the mean number of miles driven annually under the new contracts, H, is less than 13,480 miles. He takes a random sample of 80 cars under the new contracts. The cars in the sample had a mean of L3,280 annual miles driven. Is there support for the claim, at the 0.01 level of significance, that the population mean number of miles driven annually by cars under the new contracts, is less than 13,480 miles? Assume that the population standard deviation of miles driven annually was not affected by the change to the contracts. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified…According to a leasing firm's reports, the mean number of miles driven annually in its leased cars is 12,260 miles with a standard deviation of 1380 miles. The company recently starting using new contracts which require customers to have the cars serviced at their own expense. The company's owner believes the mean number of miles driven annually under the new contracts, μ, is less than 12,260 miles. He takes a random sample of 27 cars under the new contracts. The cars in the sample had a mean of 12,088 annual miles driven. Assume that the population is normally distributed. Is there support for the claim, at the 0.10 level of significance, that the population mean number of miles driven annually by cars under the new contracts, is less than 12,260 miles? Assume that the population standard deviation of miles driven annually was not affected by the change to the contracts. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more…
