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In a random sample of 23 ?people, the mean commute time to work was 33.8 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a? t-distribution to construct a 90?% confidence interval for the population mean mμ. What is the margin of error of mμ?? Interpret the results.
The confidence interval for the population mean mμ is left parenthesis nothing comma nothing right parenthesis. ?(Round to one decimal place as? needed.)
State the null and alternative hypotheses for the ANOVA (include definitions of parameters). What assumptions do we need to proceed with ANOVA?
Select a material, laminate stacking sequence, and thickness, to carry a uniformly distributed load p = 172 kP a. The plate is 15 cm wide and 2 m long, simply supported around the boundary.
Assuming Citicorp's advertisement is correct, what is the probability that fewer than 10% of the people in your sample will be found to have been hospitalized (at least once) during the year? Explain.
a. Define the Random Variables X and P', in words. b. Which distribution should you use for this problem? Explain your choice.
Are there any high leverage points or extraordinarily influential points? Briefly justify your answer. I. The Variance inflation factors are below. Are there any problems of multicollinearity?
An article in Money compares investment in an income annuity, offered by insurance companies, and a mix of low-cost mutual funds.
What are the mean and standard deviation for the superintendent's district? What are the mean and standard deviation for the comparison district? State an appropriate null hypothesis for this analysis
The application envelopes at random looking for 10 applicants with GRE scores over 600. How many envelopes do you think the staff will need to open?
What are the three criticisms of null hypothesis statistical testing?
Construct and interpret a 90% confidence interval estimate for the regression slope coefficient.
Determine whether there is suffcient evidence to support the clain that the new balls have bounce heights with a mean different from 92.84 in. Does it appear that the new baseballs are different?
The types kinds of statistical information collected in your professional setting. Provide examples to illustrate the information/data.
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