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In a random sample of 400 employees of a local company, 180 were female.
a. At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
b. At 95% confidence using the p-value approach, test to determine if the proportion of females in the company is significantly less than 50%.
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
Illustrate the maximum number of reservations that it could accept for a flight with a capacity of 160, if it needs the probability of accommodating all reservation holders to be at least 95%.
To find out whether two categorical variables are independent, one should use the.
How large should n be so that the standard deviation of is no more than 0.01 and sampling distribution
A loaf of bread is normally distributed with a mean of 22 oz and a standard deviation of 0.5 oz. What is the probability that a loaf is more than 22.25 oz?
Explain why random samples are preferred to nonrandom samples.
Relatively speaking, who performed better on the test, you, with an 86, or your friend? Why?
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
Develop a probability for the number of students in the sample who watch soap operas.
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
Which statement is true for a statistical study?
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