QUESTION 9 In a bakery, a sample of 19 days was taked to study the daily sales. It was found that the mean daily sales are 124 with a sample standard deviation is 86 The 98 percent upper confidence limit for the population mean a daily sale would be? (Round answer to two decimal places ex. 2.09)
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Q: QUESTION 9 In a bakery, a sample of 19 days was taken to study the daily sales. It was found that…
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- QUESTION 18 In a bakery, a sample of 19 days was taken to study the daily sales. It was found that the mean daily sales are 124 with a sample standard deviation is 68. The 98 percent upper confidence limit for the population mean a daily sale would be? (Round answer to two decimal places ex. 2.09)Question 23 The mean age when smokers first start is 13 years old with a population standard deviation of 1.9 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 33 smokers found that their mean starting age was 12 years old. Do the data support the claim at the 5% significance level? What are the correct hypotheses? Ho:Select an answer y years H:Select an answer v? v years Based on the hypotheses, find the following: Test Statistic z = (Give answer to at least 4 decimal places) p-value (Give answer to at least 4 decimal places) II Based on the above we choose to Select an answer The correct summary would be: (Select an answer mean age smokers first start is different than 13. v that the claim that the Submit Question a, dpThe mean change in muscle thickness observed after a 4-week training regimen was 4 mm, and the 95% confidence interval (CI) for mean change was (-0.5, 8.5). Which is the best scientific conclusion for the effectiveness of this regimen ?
- QUESTION 19 It was found that the mean annual turnover rate of the Aspirin medicine bottle is 19. The management think that the mean is changed. Therefore, a random sample of 86 is chosen that shows the average is 14 and the standard deviation is 14. Use 0.00 significance level to test this claim Bosed on the above, the test statistic is equal to? (Round answer to two decimal places ex. 2.09)if the gpa is 2.75 of 600 students with a confidence level of 90% what is the margin of error if the standard deviation is .45From a sample of 36 graduate students, the mean number of months of work experience prior to entering an MBA program was 33.39. The national standard deviation is known to be 19 months. What is a 95% confidence interval for the population mean? A 95% confidence interval for the population mean is (Use ascending order. Round to two decimal places as needed.)
- Question 2QUESTION 4 Sara wants to determine the mean play time of media clips on her smartphone. A random sample of 36 media clips revealed a mean of 155 minutes and a standard deviation of 16 minutes. Find the upper confidence limit (UCL) of the 93% confidence interval estimate for the mean play time of media clips on Sara's smartphone. Round your answer to two decimal places.Question 6 Ho Select an answer 0² The mean age when smokers first start is 13 years old with a population standard deviation of 2 years. A researcher thinks tha: 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 34 smokers found that their mean starting age was 12.3 years old. Do the data support the claim at the 10% significance level? What are the correct hypotheses? Н1 Ba Te HD SIX P s² Critical Values = ± years years find the following: (Give answer to at least 4 decimal places) (Give answer to at least 4 decimal places) Based on the above we choose to Select an answer The correct summary would be: Select an answer mean age smokers first start is different than 13. that the claim that the
- A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. The mean is found to be 7.8 reproductions and the population standard deviation is known to be 2.2 If a sample of 697 was used for the study, construct the 85% confidence interval for the true mean number of reproductions per hour for the bacteria. Round your answers to one decimal placeANSWER PART B ONLYA recent study of 25 randomly selected employees of a company showed that the mean of the distance they traveled to work was 14.09 miles. The standard deviation of the sample mean was 2.28 miles. Find the upper bound 95% confidence interval of the true mean. Round your answer to 3 decimal places.