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A sample of 1545 men and an independent sample of 1691 women were used to compare the amount of housework done by men and women in dual-earner marriages. The study showed that 67.5% of the men felt that the division of housework was fair and 60.8% of the women felt the division of housework was fair. Is the proportion of men who felt that division of housework was fair greater than the proportion of women who felt the division of housework was fair? Use alpha = .05 for the test.
How might variance and standard deviation be applied to a real-world business-related problem? Provide a specific application in which these measures are useful.
The moment generating function of normal distributed random variable ,Y, with mean and variance .derive the moment generating function of X=-3Y+4.what is the distribution of X? why?
Suppose that X1,..,Xn form a random sample from the normal distribution with unknown mean M and unknown standard deviation S, and let m and s denote the MLEs of M and S. for the sample size n=17, find a value of k such that P(m > M +ks) = 0.95
The largest value in a set of data is 160, and the smallest value is 70. If the resulting frequency distribution is to have six classes of equal width, what will be the class interval?
Design an imaginary study or discuss an actual study you've read about that has an experimental or quasi-experimental design that used or would use t-tests or ANOVAs in the data analysis.
A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion.
The sampling plan is perhaps the single most important aspect of generalizing research findings beyond the study sample. In a quantitative research study, what method of sampling allows for the greater generalization of findings?
The estimated miles per gallon ratings of a class of automobiles are normally distributed with a mean of 12.8 and a standard deviation of 3.2. What is the probability that one of these automobiles selected at random would get:
Determine the event that the sum of the numbers falling uppermost is less than or equal to 7
Computing probability values using normal distribution - Find the proportion of the observations will fall in the interval from 40 to 60?
Test of claim for the statement made for a given paired sample:
Nancy believes that the average running time of movies is equal to 140 minutes. A sample of 4 movies was taken and the following running times were obtained. Assume the population of the running times is normally distributed.
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