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In a large-sample test of hypothesis to compare the two means, the test statistic was computed to be z= 1.22. Compute the two-tailed p-value of the test.
A researcher claims that the standard deviation of the ages of cats is smaller than that for dogs. A random sample of 29 cats has a standard deviation of 2.7 years and a random sample of 16 dogs has
A sample of 40 CD's from a student's collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes. Construct a 95% confidence interval for the mean. Assume all stat
A regression line was calculated as y' = 42.5 + 3.1 x. What is the predicted value of y' when x = 2.5 ?
A basketball coach claims that by taking a "special" vitamin, a weight lifter can increase his strength. Eight players are selected and given a test of strength. After two weeks of training, supplem
Among 2380 randomly selected females 84% wear seat belts. Write the null and alternative hypothesis, find the test stastic and critical values, the p-value.
According to police sources a car with a certain protection system will be recovered 88% of the time. Find the probability that 4 of 9 stolen cars will be recovered.
Both samples were of 16 women and the standard deviation for each was 0.6. At Alpha = .01, test the claim that the means are equal. Then calculate the 99% confidence interval for the difference of
Suppose 36 of these resistors are randomly selected to be used in a circuit. What is the probability that the average resistance of the 36 resistors is between 199 and 202 ohms?
Shown below are the sales revenue and advertising cost data for seven companies published by International Advertising Age.
A cup of Fourth of July candies contains 6 red, 7 white, and 8 blue candies. If five are randomly selected, then what is the probability that at most two colors are represented?
The sample mean was 18.3 years with a standard deviation of 4.35 years. Construct a 95% confidence interval for the mean age that all smokers begin smoking.
A poll of 1200 randomly selected students was conducted. Would confidence in the results increase if the sample size were 3600 instead of 1200? Why or why not?
The heights of 18-year-old men are approximately normally distributed with mean 68 inches. What is the probability that an 18-year-old man selected at random is greater than 69 inches tall?
Give an example of how to use a t-test to analyze the data from the Table of Variables.
A young boy asks his mother to get five game-boy cartridges from his collection of 10 arcade and 5 sports games. How many ways are there his mother gets 3 arcade and 2 sport games respectively?
What is the p-value for a sample of 180 undergraduate students with a sample mean credit card balance of $3325?
Given that the doctor makes an incorrect diagnosis, the probability that the patient enters a lawsuit is 0.90. What is the probability that the doctor makes an incorrect diagnosis and the patient sues
Make a histogram. Describe its shape. Predict, based on the shape, the relationship between the mean and median. Find the actual mean and median.
Mean is 100 and SD is 16. Doug has an IQ of 76. What proportion of people have a higher IQ than Doug?
Over what period does the data cover? Are there any missing values for return? If so why? When did the min and max occur? What events occurred in these months that may have caused such an extreme pe
The Cost function of a company depends on an external variable k. Find the value of k so that the fixed cost for the firm is 10000. What would be the variable cost for the company?
The sample mean and sample variance of five data values are, respectively, ¯x =104 and s2 =4. If three of the data values are 102, 100, 105, what are the other two data values?
Download the monthly returns for Freddie Mac from CRSP since August 1, 1989. Make sure you include price, high, low, share volume, return, value-weight return of all stocks with dividends, equal-wei