Subtract 10 from each item in the given sample, and compute the mean and standard deviation of the new samp 20, 40, 43, 26, 24, 48, 12 ...
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- For the Given values of 56, 67.9, 68, 53.8 and 69.8, Calculate 1 Mean 2Algebraic Sum of deviation 3 Variance 4 Standard Deviation.The standard deviation of the change in exercise group was CORRECT. It is rejecting the standard deviation of change in the control group.A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 99.3-cm and a standard deviation of 1.5-cm. For shipment, 25 steel rods are bundled together.Find P27, which is the average length separating the smallest 27% bundles from the largest 73% bundles. P27 =
- The lengths of nails produced in a factory are normally distributed with a mean of 3.343.34 centimeters and a standard deviation of 0.070.07 centimeters. Find the two lengths that separate the top 3%3% and the bottom 3%3%.An industrial engineer is conducting a time study for a work element. The select time is 4.5 minutes, and the sample standard deviation of the observed time is 20 seconds. What is the appropriate sample size if the estimate is to be 5 percent of the true average time 95 percent of the time?One researcher collected a sample of expenses for advertisement from 5 companies as follows: 50, 60, 55, 58, 72 The standard deviation is
- In a school district, all sixth grade students take the same standardized test. The superintendant of the school district takes a random sample of 3030 scores from all of the students who took the test. She sees that the mean score is 169169 with a standard deviation of 7.06747.0674. The superintendant wants to know if the standard deviation has changed this year. Previously, the population standard deviation was 1313. Is there evidence that the standard deviation of test scores has decreased at the α=0.005α=0.005 level? Assume the population is normally distributed. Step 1 of 5: State the null and alternative hypotheses. Round to four decimal places when necessary. Step 2 of 5: Determine the critical value(s) of the test statistic. If the test is two-tailed, separate the values with a comma. Round your answer to three decimal places. Step 3 of 5: Determine the value of the test statistic. Round your answer to three decimal places. Step 4 of 5: Make the…Suppose that the average number of Facebook friends users have is normally distributed with a mean of 136 and a standard deviation of about 45. Assume forty-two individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible. Find the third quartile for the average number of Facebook friendsThe combined SAT scores for the students at a local high school are normally distributed with a mean of 1469 and a standard deviation of 296. The local college includes a minimum score of 1824 in its admission requirements. What percentage of students from this school earn scores that satisfy the admission requirement?
- A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being called back to be examined. An investigation committee randomly surveyed 70 patients. The sample mean was 1.5 hours with a sample standard deviation of 0.5 hours. How many degrees of freedom are in the sample?A department store has determined that 65% of all their sales are credit sales. A random sample of 90 sales is collected. What is the standard deviation assuming the distribution is normal?The diameter of a brand of Ping-Pong balls is approximately normally distributed, with a mean of 1.30 inchesand a standard deviation of 0.04 inch. If you select a random sample of 16 Ping-Pong balls, a. What is the sampling distribution of the mean?