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Explain what is wrong with each of the following:
a. You can use a significance test to evaluate the hypothesis Ho:p(hat)=0.6 versus the two-sided alternative.
b. The large-sample significance test for a population proportion is based on a t statistic.
c. An approximate 95% confidence interval for an unknown proportion p is p(hat) plus or minus its standard error
We forecast that 20% of group 1 and 30% of group 2 will experience outcome. If we recruit the equal number of individuals in each of the groups, how many individuals do we need to study?
the regression equation between years of employment x and discount amount y at the happy cafeteria is given byy 3x
We know that the population variance is 16. Estimate the mean number of admissions per 24-hour period with a 95% confidence interval.
question assuming a two-tailed test with alpha .05 how large a correlation is needed to be statistically significant
Determine the upper control limit (UCL) and lower control limit (LCL) for an X-Bar chart if six samples of subgroup size 5 (n=5) were collected, and the mean of the sample averages is 4.7 and mean of the sample ranges is 0.35.
the management of a department store is interested to estimate the difference in the amount of money spent by female
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test. Develop a 99 percent confidence interval for the proportion of applicants that fail the test.
Researchers studying infant head circumferences (in centimeters) wish to test if the mean head circumference differs from the historical mean of 34.5 cm. The researchers obtain a sample of 17 infants with a mean head circumference of 34.16 cm and a s..
a decision maker is considering including two additional variables into a regression model that has as the dependent
They select a random sample of 525 employment records, and find that 229 of the people are females. State the conditions needed to build a confidence interval.
1. two manufacturing plants produce similar parts. plant 1 produces 1000 parts 100 of which are defective. plant 2
Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine. The data obtained is shown in the table below.
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