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On a standard measure of hearing ability, mean is 300 and the standard deviation is 20. Give the Z score for person who scores (a) 340, (b) 310, and (c) 260. Give the raw scores for persons whose Z
A person score 81 on a test of verbal ability and 6.4 on the test of quantitative ability. For the verbal ability test, the mean for people in general is 50 and the standard deviation is 20. For the
Do students at various colleges differ in now sociable they are? Twenty-five students were randomly selected from each of three colleges in a particular region and were asked to report on the amount
Before you make a decision about Mr. Nerdly's decision, why not try the birthday game from yourself. You might want to play several times before you draw any conclusions.
Interpreting a scatter diagram.Make up a scatter diagram with 10 dots for each of the following Situations.
The Report. Explain your investigation in a report. Follow conventions as described in the general guidelines for writing up Special Problems. You would be graded on both the accurateness of your wo
The mean weight of trucks travelling on a particular section of I-475 is not known. A state highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing the weigh
Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The average tread life was found to be 50,000 miles with a standard deviation of 3,500 miles. What
A bank wishes to estimate the mean balances owed by customers holding MasterCard's. The population standard deviation is estimated to be $3.00. If a 98 percent confidence interval is used and an int
Voters sampled said they planned to vote for the republican candidate for president. Using the 0.95 degree of confidence, what is the interval approximation for the population proportion (to the nea
A random sample of size 15 is selected from a normal population. The population standard deviation is unknown. Suppose that a two- tailed test at the 0.10 significance level is to be used. For what
A manufacturer of stereo equipment introduces new models in the fall. Retail dealers are surveyed immediately after the Christmas season regarding their stock on hand of each piece of equipment.
Based on the Nielsen ratings, the local CBS affiliate claims its 11:00 pm newscast reaches 41 percent of the viewing audience in the area. In a survey of 100 viewers, 36% indicated that they watch t
The mean number of travel days per year for salespeople employed by hardware distributors needs to be estimated with a 0.90 degree of confidence. For small pilot study mean was 150 days and the stan
A program for generating random numbers on a computer is to be tested. The program is instructed to generate 100 single digit integers between 0 and 9. The frequencies of the observed integers were
Scatter diagram, coefficient linear correlation, covariance, Sx and Sy.
The following table is from the publication of Vital and Health Statistics from the centers for Disease Control and Prevention/ National Center for Health Statistics. The individuals in the followin
Increased research and discussion have focused on number of illnesses involving the organism Escherichia coli (01257: H&), which causes a breakdown of red blood cells and intestinal hemorrhages
When the diameters of the affected tendon were measured for a sample of 31 patients, the average diameter was 9.80. If the average tendon diameter in the population of patients with AT is no differe
Perform a study to evaluate the characteristics of patients discharged against medical advice from institution with those control patients discharged with physicians' approval according to a case-co
Insert hypothetical values for each cell in the table. Build four probability questions using the table that you as an instructor of statistics may ask a class of students for a test in probability.
Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The average tread wear was found to be 50,000 miles with a standard deviation of 3,500 miles. What
An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed an average preparati
An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed the average preparat
She knows that for all basketball players their average math SAT is 442 with a standard deviation of 92. She then selects a sample of 102 football players and finds that their average math SAT is 4