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Consider the following two economic characteristics with two possible outcomes each: employment (increase, decrease) and economic trend (positive, negative). Let the probability of a decreasing employment be 0.6 and the probability of a positive economic trend 0.5. Further, assume that the probability of a decreasing employment given a negative economic trend is 0.7.
Determine the probability of a positive economic trend given an increasing employment. Are employment and economic trend independent?
The probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage?
The number of shark attacks and deaths over a recent 5- year period is shown. Find the mean, median, mode, midrange, variance, and standard deviation for the date. Which data set is more valuable?
Describe a research problem that would benefit from Factor Analysis. What are the variables and what would you hope to achieve?
Work through a simple regression calculation using intrinsic job satisfaction nd extrinsic job satisfaction. Select thirty data points to use for each group.
A local politician in this town has stated that the average property taxes are $1800 and most people do not pay more than this amount. Conduct a test at the alpha = .01 level to determine if this is true. For this test, consider a sample size of 3..
A seven year old study reported that women whose mothers used the drug DES during pregnancy were twice as likely to develop tissue abnormalities that might lead to cancer as women whose mothers did not take the the drug.
Construct the 90% confidence interval for the true population proportion of all voters in the state who favor approval.
If 36 women are selected at random, find the mean, and standard deviation, of the population of sample means. Suppose that the sampling is done without replacement and use a finite population correction factor.
Reynolds Electronics accepts a lot from a particular supplier if the defective components in the lot do not exceed 1%. Suppose a random sample of five items from a recent shipment is tested.
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
Find a 95% confidence interval for the mean amount of money µ spent at the waiter's tables.
Calculate the range, variance, and standard deviation for these sample data.
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