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The researcher suspects that the new drug results in greater average reduction in blood pressure than the old drug does. The P-value for the test described in (again, using Option 2 for degrees of fre
For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%
A histogram showing the different responses from five groups of government employees is used in a report to emphasize the different results. A group accounted for 60% of the response, another 20%.
What theorem states that a distribution of sample means is approximately normally distributed if the sample size is large enough?
What is the test value for a test of the difference between these two population proportions?
A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose for a random sample of 956 people age 15 or older, the mean amount of time spent eating or drinki
Assume that matched pairs of data result in the given number of signs when the value of the second variable is subtracted from the corresponding value of the first variable. Use the sign test with a
A chi-square test for goodness of fit is used in a situation with n = 60 subjects distributed over three categories. The df value for this test is.
If the alpha level is increased from a = .01 to a = .05, what happens to the size of the critical region.
A student takes a calculus midterm and a history midterm. The mean and standard deviation on the calculus midterm are 58 and 15 points while they are 63 and 35 on the history midterm. Suppose she ge
The mean and standard deviation on a calculus mid term are 66 and 19 points while they are 72 and 15 on the final. If a student gets 75 points on the midterm, what is the comparable grade on the fin
Find the expected value (in dollars) of the amount won by one entry. Find the expected value (in dollars) if the cost of entering this sweepstakes is the cost of a postage stamp (34 cents)
A typing competency test yields scores which are normally distributed with a mean of 80 and a standard deviation of 10. Approximately what percentage of the test scores fall between 70 and 100?
What is the expected attendance? If tickets cost $20 each, the band will cost $300000, pluse $55000 for administration. What is the expected profit?
Consider the experiment of tossing two dice. Let Y denote the absolute dierence of the upturned faces. i.e. if X is the value on the first die and Z is the value on the second, then Y= |X-Z|
Find the probability that a data value picked at random from a normally distributed population will have a standard score that corresponds to the following: Less than 100.P(Z<100)
The FDA is comparing the mean caffeine contents of two brands of cola. Independent random samples of 6-oz. soda cans of each brand were selected and the caffeine content of each soda can was determi
Let x represent the absolute value of the difference between the number of heads and the number of tails when a coin is tossed 38 times.
In a study to estimate the proportion of residents in a city that support the construction of a new bypass road in the vicinity, a random sample of 1600 residents were polled. Let X denote the numbe
The time in hours for a worker to repair an electrical instrument is a Normally distributed random variable with a mean of ? and a standard deviation of 50. The repair times for 12 such inst
A political strategist calims that 55% of voters in Madison County support his candidate. In a poll of 200 randomly selected voters, 98 of them support the strategist's candidate. At a = .05, is the
Suppose that 17% of the undergraduates are seniors while the corresponding percentages for juniors, sophomores, and freshmen are 18%, 19%, and 46% respectively. What percent of the students use the
The purpose of this process is to ensure the defect rate is no more than 6%. Occasionally, by bad luck, even if the defect rate is no more than 6%, more than one defective tire is found from the cho
Customers arrived at the cashier counter according to a Poisson distribution at the average rate of 8 customers per hour. What is the average time (in minute) a customer would spend in the store?