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Which of the following would NOT be considered and potential pitfall for a researcher?
A. Unconscious bias on the part of the researcherB. Assuming causality based on observationsC. Making conclusions about a large population from a small sample sizeD. Attaching a low level of importance to outliers in a large population
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
Historically the average age of European soccer players is reported as 26 years with a standard deviation of 4 years. A random sample of 81 European professional soccer players has an average age of 27 years.
To be 99% sure that we will not be late in completing the project, what is the requested completion time in work-days?
The probabilities that an automobile salesperson will sell 0, 1, 2, or 3 cars on any given day in February are, respectively, 0.19, 0.38, 0.29, and 0.15.
What is the null hypothesis? What is your decision if a = 0.01?
Use the table to determine whether the correlations are significant and how you would interpret the results. The correlation between speed and strength for 20 women is .567. Test these results at the .01 level using a one-tailed test.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
For the sheet-metal stamping machine in certain factory, the time between failures, X1 has a mean between the failures, of 56 hours and a variance of 16 hours.
At the .05 significance level, can we conclude that there is a difference in their mean times?
Suppose that we observe a random sample size n from a normally distributed population. If we are able to reject H0:µ = µ in favor of a two-tailed alternative hypothesis at the 10% significant level
Describe your answer to a person who has never had a course in statistics.
What are the assumptions of regression analysis and how do you evaluate them?
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