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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
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 fair die is rolled 8 times. What is the expected sum of the 8 rolls?
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?
Using a 5% level of significance and a sample size of 26, what is the critical value for a one-tailed hypothesis test?
Determine which test statistic you will use: the standard normal distribution, or the student's t distribution. Explain why you chose this test statistic.
The average salary was $25,752. The population standard deviation is $2,553. What is the 95% confidence interval for the mean salary of all graduates from the English Department?
A coin is tossed four times. Show the sample space and find the probability of getting a simple event of three heads and one tails.
The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is normally distributed with a mean of 1250 chocolate chips and a standard deviation of 100 chocolate chips.
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
Two cards are drawn, without replacement, from a standard deck of fifty-two cards. Find the probability of these events.
A bank wishes to estimate the mean credit card balance owed by its customers. The population standard deviation is estimated to be $313. If a 98 percent confidence interval is used and an interval
In a doctor's office there are nine nurses and eight physicians. Six nurses and four physicians are females. If a person is selected from the doctor's office, find the compound probability that the
Describe a run chart and give an example. Refer to the values on each of the axes as you describe the run chart.
Describe the sign test. What types of hypotheses is it used to test? What is the underlying concept?
Describe the Wilcoxon ran-sum test. What type of hypotheses is it used to test? What assumptions are made for this test? What is the underlying concept?
Consider the following scenario: flipping one coin and rolling a ten-sided die. Show the sample space and find probability of getting a compound event of tails and rolling a 10.