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- What do you mean by Sample Variance, Sample Standard Deviation,and Standard Error?Suppose a baker wants to know, on average, how many pastries they sell in a day. They sampled over 4 days. On the first day they sold 10, on the second day they sold 12, on the third day they sold 18, and on the fourth day they sold 16. The population standard deviation of pastry sales is 3. What is the point estimate (average) number of pastries sold? 26 08 056 O 14 NexQuestion of the day. The mean weekly sales of the chocolate bar in candy stores was 146-3 bars per store. After an advertising campaign the mean weekly sales in 22 stores for a typical week increased to 153-7 and showed a standard deviation of 17-2. Was the advertising campaign successful?
- A sample of n = 16 scores has a mean of M = 56and a standard deviation of s = 12 . a. Explain what is measured by the sample standard deviation. b. Compute the estimated standard error for the sample mean and explain what is measured by the standard error.K The first statistics exam had a mean of 71 and a standard deviation of 15 points; the second had a mean of 82 and a standard deviation of 5 points. Anna scored a 84 on both tests. Megan scored 94 on the first exam and 74 on the second. They both totaled 168 points on the two exams, but Anna claims that her total is better. Explain. The total of Anna's z-scores is, which is greater than Megantotal of (Round to one decimal place as needed.)7. It is well known that car buyers often add accessories to their new cars. A sample of 179 Ottawa purchasers yielded a sample mean of $5000 worth of accessories added to the purchase above the base sticker price. Suppose the cost of accessories purchased for all Ottawa has a standard deviation of $1500. (a) Calculate a 95% confidence interval for the average cost of accessories on Ottawa. - Section Break - (b) Determine the margin of error in estimating the average cost of accessories on Ottawa. (c) What sample size would be required to reduce the margin of error by 50%?
- The distribution of annual profit at a chain of stores was approximately normal with mean u = $66,000 and - standard deviation o = $21,000. The executives conducted an audit of the stores with the lowest 20% of profits. What is closest to the maximum annual profit at a store where the executives conducted an audit? Round to the nearest thousand dollar.A sports shop selects a random sample and records the sales of items made in China and thosemade in America. Country of origin n mean St.Deviation China 50 22.5 9.75 America 33 33.15 11.6 What is the SE Mean for the sales from China?2) You work for the FTC. A manufacturer of detergent claims that the mean weight of detergent is at least 6.5 lb. You take a random sample of 64 containers. You calculate the sample average to be 6.43 lb. with a standard deviation of .14 lb. At the 0.02 level of significance, is the manufacturer correct?
- SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Find the mean and the standard deviation. (Round squared deviations to nearest whole number and final answer to 2 decimal places.) Age (years) Frequency 10 up to 20 3 20 up to 30 7 30 up to 40 18 40 up to 50 20 50 up to 60 12The mean was found to be u = 70 so now we need to find the standard deviation o. The standard deviation is calculated as follows where n is the sample size, 350, and p is the probability of a success, 0.2. Find the standard deviation. V np(1 – p) O = V 350( )(1 – 0.2)this population, and the mean of each sample is determined. The mean, ux,is The standard error of the mean, Oy, is (Round your answer to 2 decimal places). QUESTION 4 The average number of miles driven each day by a group of drivers is 20.7 miles with a standard deviation of 6.5 miles. If you randomly select 50 drivers, what is the probability that the average number of miles driven each day is between 19.4 and 22.5 miles? Round your answer to 4 decimal places. Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers 5,337 MAY 24 MacBook Air B口 F3 888 F2 F4 1880 %23 24 4 3 T