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1. A researcher wished to compare the average amount of time spent in extracurricular activities by high school students in a suburban school district with that in a school district of a large city. The researcher obtained an SRS of 60 high school students in a large suburban school district and found the mean time spent in extracurricular activities per week to be = 6 hours with a standard deviation s1 = 3 hours. The researcher also obtained an independent SRS of 40 high school students in a large city school district and found the mean time spent in extracurricular activities per week to be = 4 hours with a standard deviation s2 = 2 hours. Let µ1 and µ2 represent the mean amount of time spent in extracurricular activities per week by the populations of all high school students in the suburban and city school districts, respectively. If the researcher used the more accurate software approximation to the degrees of freedom, he would have used which of the following for the number of degrees of freedom for the two-sample t procedures?
A. 39B. 59C. 98
2. It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. These data should be analyzed with a
A. two-sample t test.B. paired samples t test.C. two-sample z test.
3. The heights (in inches) of adult males in the U.S. are believed to be Normally distributed with mean µ. The average height of a random sample of 25 American adult males is found to be = 69.72 inches and the standard deviation of the 25 heights is found to be s = 4.15. A 90% confidence interval for µ is
A. 69.72 ± 1.09.B. 69.72 ± 1.37.C. 69.72 ± 1.42.
The population of car speeds is approximately normally distributed. Determine a 90% confidence interval estimate for the speed of all cars.
In 2001, an estimated 78% of executives believed that age bias was a serious problem. In a 2004, 82% of the executives surveyed considered age bias a serious problem.
These data represent the ages of drivers and the number of accidents reported for each age group in Pennsylvania for a selected year. Find the equation of the regression line for the given data.
Which of the following is the correct set of probabilities for X and if a student is selected at random, the probability he or she is either a Junior or a Senior
You will be graded on accuracy, completeness (addressing each point above), and effectiveness (utility, ease of reading).
Explain how the marketing analyst can use independent samples to collect the data.
Using the least squares coded method, determine the equation for the straight line going through the earnings. Project, using the equation for the average hourly earnings for the year 1990
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot." What is the standard deviation for the sample proportion?
Average (arithmetic mean) of 15 years with a standard deviation of 4 years. How does the relative dispersion in the distribution of salaries compare with that of the lengths of service?
What is the probability of selling your home for the median price in your city (My zip code is 91730 Alta Loma). How has the graphical display of data changed in the last 10 years? How will it change in the next 10 years?
Calculate a 95% confidence interval for the difference in the proportions of birth defects when the contaminated well was in use and when the contaminated well was not in use.
Which of the given properties doesn't apply to theoretical normal distribution?
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