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In a murder trial in Los Angeles, a shoe expert stated that the range of heights of men with a size 12 shoe is 70 inches to 77 inches. Suppose the heights of all men wearing size 12 shoes are normal
The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $38,710 and a standard deviation of $794. About 72 percent of the i
An investigator hypothesizes that cholesterol levels in children might be effected by educating their parents on proper nutrition and exercise.
An investigation of the effectiveness of a training program to improve customer relationships included a pre-training and post-training customer survey. Seven customers were randomly selected and co
A 90% confidence interval for a proportion is (0.265, 0.385). What is the probability that the population proportion is greater than 0.385?
The results of a mathematics placement exam at two different campuses of Mercy College follow:
A two-variable data set has a correlation coefficient of 0.84. What is the coefficient of determination?
Find the probability of rolling a six first and a two second when rolling a fair six-sided die.
The Central Limit Theorem helps researchers answer questions about Sample means, for small sample sizes.
What is the decision rule at the 0.01 level of significance to test if the new design increased the absorption amount of the sponge?
A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces. After the redesign, the absorption amounts of a sample of sponge
Which of the following is not a property of all normal distributions?
An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings.
A binomial experiment has 10 trials with a probability of success of 0.62 in each trial. What is the standard deviation of the binomial random variable?
The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $39,570 and a standard deviation of $798. About 65 percent of the i
In a two-tailed hypothesis test for a mean the critical values were -1.83 and 1.83. If the test value of the mean is 1.67, what is the conclusion of the test?
How many different groups of movies can Kelly see over spring break if she will select a different movie to watch each of five days from a list of 12 movies showing at the theater?
Find a 95% confidence interval for the population mean if a sample of size 20 has a mean of 18.2 and a sample standard deviation of 3.6
What percent of the area under the normal curve is between z = 1.22 and z = 1.96?
In a sample of 800 people, 326 of them were found to have frequent headaches. What is the sample proportion of people with frequent headaches?
A regression line for a data set was found to be yt= 1.25 - 3.84x . What is the point prediction of y for x = 20?
Each researcher is trying to estimate the mean hours of sleep that freshmen get at night, and each one constructs a 95% confidence interval for the mean. Approximately how many of these 100 confiden
A fair die is rolled 8 times. What is the expected sum of the 8 rolls?