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The residents of a housing development for senior citizens have completed a survey in which they indicated how physically active they are and how many visitors they receive each week.
a. Draw a scatterplot.b. Compute the pearson correlation r.c. Are these two variables related for the 10 cases reported here?d. Compute b0 and b1 and find the least-squares regression line.e. Interpret the r2.f. Using the least-squares regression line, what would be the predicted number of visitors for a senior citizen whose level of activity was 5? How about a person who scored 18 on level of activity?g. Referring to item f), is there a problem of predicting number of visitors using the regression line? Explain briefly your answer.
Case Level of Activity Number of VisitorsA 10 14B 11 12C 12 10D 10 9E 15 8F 9 7G 7 10H 3 15I 10 12J 9 2
A random sample of 500 participants was recruited for the study ? Subjects were allowed to elect to participate in an 3-month exercise program or serve as a control subject (190 chose the program, 310 chose to serve as controls)?
An airline has a policy of booking as many as 17 persons on an airplane that can seat only 16. Find the probability that if the airline books 17 people, not enough seats will be available.
Determine how large a sample would be necessary to estimate the population proportion with a margin of error of .05 at 95% confidence
construct a frequency distribution table for these data. what type of graph would be appropriate to show the frequency distribution for these data?
Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
If a sampleof50 customers is selected on a given day, what is the probability, given your selected delivery time that fewer than 3 customers will receive a free newspaper?
How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test? Why are raw scores transformed to standardized scores, such as z-scores, in order to interpret those raw scores?
Suppose the probability that a federal income tax return conatins an arithemetic error is 0.2. If 10 federal income tax returns are selected at random,
We are interested in testing to find out whether the variance of the population is vitally more than 0.003
Cite an example of how you could/would apply a test of a hypothesis for a single population proportion, two tail test described in the lecture to real world situations?
In each of the following situations, the sampling frame does not match the population, resulting in undercoverage. Give examples of population members that might have been omitted:
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