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The National Sporting Goods Association (NSGA) conducted a survey of the ages of individuals that purchased skateboarding footwear. The ages of this survey are summarized in the following relative frequency distribution. Suppose the survey was based on a sample of 200 individuals
Calculate the mean, variance and standard deviation of the age of individuals that purchased skateboarding shoes. Use 10 as the midpoint of the first class. Round answers to 2 decimal places.
a recent study focused on the number of times men and women send a twitter message in a day. the information is
Does a regression model imply causation? Why or why not? Provide an example which provides and independent and dependent variable from your place of work.
Cholesterol levels are measured as followed: 185 225 240 196 175 180 194 147 223. Generate a 95% confidence interval for the true mean total cholesterol levels in children?
What descriptive summary measures would you use to present the data. which measure is the best to use and which is the worse and why?
suppose n90000 n18000 s50a. compute the standard error of xbar using the finite population correction factor.b. repeat
a client gives you a data set of 30 observed values that represent the number of gallons of gas that 30 individual
Given that x is a normal variable with mean u = 47 and standard deviation = 6.2, find:
Suppose a simple random sample of 30 days is selected for observation. What is the probability that the sample mean for the 30 days will be between 300 and 340 books?
Suppose the mean cannot be adjusted but the standard deviation can be reduced. What maximum value of the standard deviation would make 90% of the parts acceptable to the consumer? (Assume the mean to be 1.012)
According to an Internet posting, 80% of adults enjoy drinking beer. If a group of 3 adults is selected at random, find the probability that none of them enjoy drinking beer.
What can you conclude from chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches? Show all work.
Use a 1% level of significance to test the claim that there are more calls during the night than in the day.
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