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Q1) As part of contract negotiations, management claims that mean annual salary for clerical workers is $30,000. Union would like to illustrate the mean is lower. Random sample of 17 annual clerical salaries is collected and results sample mean of $28,157 and standard deviation of $3500. Is this enough evidence to support Union's position? Use significance level of a = 0.05. You may suppose the mean annual salaries are normally distributed.
Q2) It is usually accepted that convicted burglars spend average of 18.7 months in jail. To check this claim researcher takes random sample of 50 such cases from court files and determines that x-bar = 20.5 months. Supposing σ is known to be 7.9 months; does sample evidence support belief that average stay is 18.7 months at the 0.025 level of significance?
The formula for a 95% confidence interval yields the interval 640 ± 5.88. Find out whether each of the given statements is true or false.
Note that Σ x = 2233 and Σ x 2 = 138,053. At the 5% level of significance, can the instructor conclude that the new mean is different from 64?
A psychologist determined that the number of sessions required to obtain the trust of a new patient is 1, 2, and 3. Let x be the random variable indicating the number of sessions required to gain the patient's trust. The following probability fu..
Illustrate what amount of sales would be required to be a super savings club member. Elucidate amount of sales would be required to be a gold club status.
Data is distribution of the most popular colors for 2005 model luxury cars made in North America. Design the pie chart and bar graph for data.
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
The researcher computes the sum of squares for groups as SSG = 40030 and the sum of squares for error as SSE = 414780. The numerical value of the ANOVA F statistic is
If life of wild pheasants follows a normal distribution with a mean of 9 months and a variance of 9, what percent of the population will be less than 11 months of age.
What is the probability that more than one machine is in the system? Probability that more than two are broken and waiting to be repaired or being serviced? More than three? More than four?
Is there evidence of violations of the usual ANOVA assumptions of equal variances and normal populations? Set up and perform appropriate TESTS at the α = 0.05 level of significance.
What is the probability that a particular driver had exactly two speeding violations?
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
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