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When people get married for the first time, the husband is, on average, 2 years older than the wife. The standard deviation of the difference in age is roughly 2.5 years. Suppose it is reasonable to assume that the distribution of the difference in age between the husband and the wife is normal. Twelve recently married couples (all first marriages) are to be selected and the average difference in age is to be calculated.
What is the probability that the average age of the wives in the sample is older than the average age of the husbands?
Among a group of 165 students 8 are taking calculus, discrete structures, and computer science; 33 are taking calculus and computer science; 20 are taking calculus and discrete structures; 24 are taking discrete structures and computer science;
The inside diameter of a randomly selected piston ring is a random variable with mean value 12 cm and standard deviation 0.02 cm.
Crime rate and population. Research by law enforcement agencies has shown that the crime rate is correlated with the U.S. population. Would you expect the correlation to be positive or negative? Explain.
forty-three percent of adults say they get their financial advice from family members. you randomly select 14 adults
A veterinarian collects data on the number of times race horses are raced during their career. The researcher finds the average number of races a horse enters is = 15.3 with a standard deviation of s = 6.8 in a sample of n = 20 horses. The standard e..
Determine the mean, median, and the standard deviation. Determine the coefficient of skewness using Pearson's method. Determine the coefficient of skewness using the software method.
Describe a group experience you have had in which there was a major conflict or controversy. Was it ever resolved?
Compare available records of the divorce rates of each Emirate based on the statistics provided by the Civil Registry or Court. Choose a sample of divorce couples , and float a questionnaire to find out the reasons why they divorced
Take a deck of cards. A deeck has 52 cards with two major colors(Red and Black), with 26 cards each. Red colors comes in two shapes(heart and diamond)
A study of 49 business graduates reported 42 students listed stats 100 as their least favorite class. what would be the 99.8% confidence interval of the proportion of business students who hate, hate, hate business?
an experiment consists of selecting a student body president vice president and a treasurer. all undergraduate
You have chosen a sample of 25 supermarkets out of the 684 you have responsibility for. These 25 have been inspected, and the number of violations of company.
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