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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%.
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
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Set up a null and alternative hypothesis to test whether this sample is falling below expectations.
In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
The mean of a normal probability distribution is 60; the standard deviation is 5.
The p-value for a test statistic is .085, what is the minimum level of significance required to reject the null hypothesis?
Suppose that a model for the joint distribution of these rvs is a bivariate normal distribution.
If the mean times for both George and Julia are actually the same, what is the probability that George will be let go?
Construct the 90% confidence interval for the true population proportion of all voters in the state who favor approval.
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