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Given the following hypothesis: H0 : μ = 400 H1 : μ ≠ 400 For a random sample of 12 observations, the sample mean was 407 and the sample standard deviation 6. Answer the following questions using the .01 significance level. (a) State the decision rule? (Negative amount should be indicated by a minus sign. Round your answers to 3 decimal places.) Reject H0 and accept H1 when the test statistic is the interval (, ). (b) The value of the test statistic is . (Round your answer to 3 decimal places.) (c) What is your decision regarding H0 ? Scrapper Elevator Company has 20 sales representatives who sell their product throughout the United States and Canada. The number of units sold by each representative is listed below. Assume these sales figures to be the population values. 2 3 2 3 3 4 2 4 3 2 2 7 3 4 5 3 3 3 3 5 Picture Click here for the Excel Data File (b) Compute the mean of the population. (Round your answer to 1 decimal place.) Mean of the population CRA CDs Inc. wants the mean lengths of the "cuts" on a CD to be 135 seconds (2 minutes and 15 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10-minute segment. Assume the distribution of the length of the cuts follows the normal distribution with a population standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CDs Inc. (a) What can we say about the shape of the distribution of the sample mean? Sample mean (b) What is the standard error of the mean? Standard error of the mean seconds. (c) What percent of the sample means will be greater than 140 seconds? (Round your answer to 2 decimal places. Omit the "%" sign in your response.) Percent % (e) What percent of the sample means will be greater than 128 but less than 140 seconds? (Round your answer to 2 decimal places. Omit the "%" sign in your response.) Percent %
If member of sales force submits the entertainment expense (dinner cost for four) of $190, must this expense be considered unusually high. Calculate and interpret z- score for each of six entertainment expenses.
Bill Russ, the production manager at Ross Co., maintains detailed records on number of times each machine breaks down and requires service all through the week. Bill records show that the Puret grinder has required repair service according to the ..
In a Gallup Poll of 1005 randomly selected Americans in April 2006, 482 responded "yes" to the question, "Do you consider the amount of federal income tax you have to pay as too high?"
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
What is the purpose of using correlation analysis? How might correlation analysis be used in business decisions or in strategy formulation and implementation?
A grab bag contains 10 $1 prizes, 7 $5 prizes, and 3 $20 prizes. three are chosen at random. find the probability that exactly two $20 prizes are chosen?
A restaurant claims that its speed of service time is less than 18 minutes. A random selection of 36 service times was collected, and their mean was calculated to be 17.7 minutes.
Propose a two sample z-test of a population mean and identify it as either an independent test or a dependent test.
The average gasoline price of one of the major oil companies has been $2,25 per gallon. Recently, the company has undertaken several efficiency measures in order to reduce prices. Management is interested in determing whether their efficiency meas..
How would you find the normal approximation to the binomial probability P(x = 5) in part A? Please show how you would calculate µ and σ in the formula for the normal approximation to the binomial, and show the final formula you would use without g..
Construct a 95% confidence interval for the proportion of adults from the West who say traffic congestion is a serious problem.
There is a program for STD/HIV/pregnancy education/prevention called Postponing Sexual Involvement (PSI) run in Atlanta. Evaluation data collected at the end of ninth grade as a follow-up to the program compared two group of adolescents
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