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The Census Bureau provides data on the number of young adults, ages 18-24, who are living in their parents' home (the data include single young adults who are living in college dormitories because i
Completion times for reading test normally distributed mean of 62.7 minutes and Sttnadard deviation 6.3. Approximately what percent of the completion time is between 50.1 and 69 minutes
Let the joint distribution of X and Y be given in the table below:
Answer the general questions about target populations, sampling frame and units for their survey. Also do you think this survey provides valuable information for comparing health plans?
The August 1996 issue of Consumer Reports contained satisfaction ratings for various health maintenance organizations (HMO's) used by readers of the magazine. The ratings were based on more than 20,
If a researcher conducts a study on the percentage of students who do and do not read their social work textbook, what would be the sample size needed for the researcher to be 94.7% confident that 7
Assuming that the 50% rate (shown above) is correct, find the range of usual values for the numbers of graduates among 380 who stay at their first job less than two years.
What is a typical flow rate? What is a representative flow rate?
Compute the probability that the number of working machines at the beginning of the next three days is two, one, and two in that order.
The length of an injected-molded plastic case that holds tape is normally distributed with a mean length of 90.2 millimeters and a standard deviation of 0.10 millimeters.
Compute the frequency for each of the three classes. Compute the relative frequency for each of the three classes. Display the results, part a, in a frequency bar graph.
The photoresist thickness in semiconductor manufacturing has a mean of 10 micrometers and a standard deviation of 1 micrometer. Assume that the thickness is normally distributed and that the thickne
If the researcher used an independent-measures design, how many subjects participated in the experiment?
Use the defining formula, the computation formula, or a calculator to compute s. (Enter your answer to one decimal place.) Add 2 to each data value to get the new data set 17, 9, 19, 16, 17. Compute s
Find the probability that none of the households are tuned to Lindsay and Tobias.
The numbers of graduates among 380 who stay at their first job less than two years should usually fall between __ and __. (Use ascending order)
Among the digits 1,2,3,4 and 5, first one is chosen and then a second selection is made among the remaining four digits. Assume that all twenty possible results have equal probability. Find the prob
Assume that all twenty possible results have equal probability. Find the probability that an odd digit will be selected the first time, second time and both times.
A researcher conducts an independent-measures research and obtains t = 2.070 with df = 28. Using a two-tailed test with α = .05, is there a significant difference between the two treatment condi
A researcher conducts an independent-measures research and obtains t = 2.070 with df = 28.
Assuming that 50% is the true percentage of graduates who stay at their first job less than two years, find the mean and standard deviation of the numbers of such graduates in randomly selected grou
The degree to which democratic and non-democratic countries attempt to control the news media was examined in the Journal of Peace Research (Nov 1997). Between 1948 and 1996 80% of all democratic re
A die is rolled n=4 times. Assume that the die is fair so that each face value on a single roll is equally likely. Let S2 denote the event that a face value of six appears twice in the 4 rolls.
Thirteen peas are generated from parents having the green/yellow pair of genes, so there is a 0.75 probability that an individual pea will have a green pod. Find the probability that among the 13 of
In a past election, the voter turnout was 53%. In a survey, 812 subjects were asked if they voted in the election. Find the mean and standard deviation for the numbers of voters in the groups of 812.