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An industrial psychologist wishes to study the effect of motivation on sales in a particular firm. 24 new salespersons are randomly divided into two groups of 12. One group is paid an hourly rate and the other group is only paid a commission. The sales volume (in thousands of dollars) is recorded for all 24 salespersons during the first month with the firm. The sample mean and standard deviation for the group paid hourly are 227.6 and 13.84, respectively. The sample mean and standard deviation for the commission group are 247.9 and 21.59, respectively. The psychologist is interested in finding evidence at the .05 significance level to support the notion that the incentive posed by offering a commission yields greater average sales volume.
Which of the following correctly describes the p-value for the test statistic in #6?
What critical value(s) would be used for comparison with the test statistic in #6?
What is the decision for the test statistic in #6?
Which of the following correctly describes the 90% confidence interval for the mean of the commission group minus the mean of the hourly group?
promising results from a specialty catalog surveythe preliminary survey results just came back on thespecialty catalog
The probability of a z falling between two points equidistant from the mean, one to the left of the mean and the other to the right og the mean is 99% what are the z ranges.
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
The probability of error in the transmission of a binary digit over a communication [2] channel is 1=103. Write an expression for the exact probability of more than 3 errors when transmitting a block of 103 bits. What is its approximate value? Ass..
Let p represent the population proportion of all numbers in the corporate file that have a first nonzero digit of 1. What is the value of the sample test statistic? (Round your answer to two decimal places.)
Assume there're three states of the economy: boom, moderate growth, and recession. The annual return on company A stock and company B stock in each state of the economy is given below
A frequency polygon: does not depend on one variable. True-False
Sketch a histogram of these data and give the modal class.
The owner of Western Clothing Company has determined that the company must sell 670 pairs of denim jeans each month to break even (i.e., to reach the point where total revenue equals total cost).
Customers arrive at an automated coffee vending machine at a rate of 4 per minute, following a Poisson distribution. What is the average number of people waiting in line?
What are differences between dependent and independent samples? Provide examples. What are the implications for determining the tests used to analyze data?
Consider the following number of defective circuit boards produced by two different machines on seven randomly selected days. To three decimel places what is the mean of machine A?
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