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The Gallup Poll asked a sample of 178 U.S. adults, "Did you, yourself, happen to attend church or synagogue in the last 7 days?" Of the respondents, 75 said "Yes" Suppose that Gallup's sample was an SRS.
a) Give a 95% confidence interval for the proportion of all U.S. adults who attended church.b) Use "Plus Four" method to have a more accurate 95% confidence interval.c) Is this proportion of sample different from the national proportion 0.5 0 p =Given α = 0.05.
Display the data in scatter plot. Calculate the linear correlation coefficient. Use the scatterplot to make a conclusion about the type of correlation.
At the 5% level of significance test whether the bottling process is carried out accurately or whether the filling machinery needs calibration. Use both the critical and the p-value approaches.
Interpret values of b1, b2, b3 and b4 in this estimated regression equation.
To find out whether the course is effective in increasing sales, the appropriate set of hypothesis for testing is:
Now make a scatter plot of data from 1982 to 1998 (again, use years since 1800). Determine a linear, power, or exponential model that explains the crude oil production during this time period.
What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83? compute the probability of charges less than $54.
An olympic archer is able to hit the bull's-eye 70% of the time. Assume each shot is independent of the others. If she shoots 6 arrows, what is the probablitly that she never misses?
Many retail stores offer their own credit cards. At the time of the credit application the customer is given a 10 percent discount on the purchase.
What proportion of 1040R tax forms will be completed in more than 114 minutes? Round your answer to at least four decimal places.
use the following sample data to test whether the GPA are different at the 0.05 level of significance.
Thirty percent of the population in a southwestern community are Spanish-speaking Americans. A Spanish-speaking person is accused of killing a non-Spanish speaking American.
The mean top of knee height of a sitting mate is 20.7 in.
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