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A social psychologist reports that "in our sample, ethnocentrism was significantly higher (P < 0.05) among church attendees than among nonattendees." This means:
A group of teenagers were monitored closely over the period of several weeks to measure how frequently they watched violent television programs.
Describe the difference between sample and a sampling distribution. Your reply must be in complete sentences and you may use sketches to help you.
Test the hypothesis that no difference exists between the groups at α = .05 and perform and report all related tests and statistics.
If the variability of the filling machine is reduced to 0.025 ounce, verify that this will lower the required average amount of coffee to 4.050 ounces and yet keep 98 percent of the jars above 4 ounces.
Test hypothesis that calories of two populations are equal. Illustrate all steps of the hypothesis testing process. Points will be deducted for missing parts.
Do the above values appear to be in statistical control, justify your answer?
What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 5 of µ? Use the value 20 for the population standard deviation of scores on this subsection.
At 0.01 significance level can we conclude that mean fare has increased? Determine the p-value?
a) Compute a 95% Confidence Interval for the true population proportion of successes. b) Based on this analysis can you conclude that the new system meets the requirement? Explain your conclusion.
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
It is reported in USA Today that the average flight cost nationwide is $342.59. You have never paid close to that amount and you want to perform a hypothesis test that the true average is actually less than $342.59. What are the appropriate hypoth..
Explain the distribution of mean of samples of size 15.
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