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Toyota provides an option of a sunroof and side airbag package for its Corolla model. This package costs $1400. Assume that prior to offering this option package, Toyota wants to determine the percentage of Corolla buyers who would pay $1400 extra for the sunroof and side airbags. How many Corolla buyers must be surveyed if we want to be 95% confident that the sample percentage is within four percentage points of the true percent all Corolla buyers?
what is the equation that predicts mortgage amount from interest rate? Compute the slope of the straight line. compute the y-intercept of the straight line.
The manufacturer of an airport baggage scanning machine claims it can handle an average of 530 bags per hour.
Does age make a difference in the amount of savings a worker feels is needed to be secure at retirement? Suppose 210 workers in the 25-33 age category and 176 workers in the 34-52 age category were involved in this study.
A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
Recent medical research demonstrated there is a strong (r=.60) correlation between the excessive weight and incidences of breast cancer. How can we interpret this statement?
Find out 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
An alcohol awareness task force at Big-Ten university sampled 20 students after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying
Several questions will be asked but the main outcome measure of interest will be the percentage of customers who were completely satisfied and plan to return and the average amount spent.
Describe how you would develop a random sample from among students.
A U.S. Travel Data Center survey of 1500 adults found that 42% of respondents stated that they favor historical sites as vacations. Find the 99% confidence interval of the true proportion of adults who favor visiting historical sites as vacations.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
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