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The growth of children from early childhood through adolescence generally follows a linear pattern. Data on the heights of female Americans during childhood, from four to nine years old, were compiled and the least squares regression line was obtained as y = 80 + 6x, where y is height in centimeters and x is age in years. Note that 1 inch is equal to 2.54 centimeters.
Develop a trend line for the demand for fertilizer using computer software. Data collected on the yearly demand for 50 pound bags of fertilizer at Wallace Garden Supply are shown in the following table:
a social psychologist wants to know how long people will wait before responding to cries for help from an unknown
Assume that the number of Telephone calls arriving in an office during a 15minute period has a Poisson distribution with mean number of calls equal 5.
in a random sample of 1002 701 said they voted in a recent presidential election.a find the best point estimate of the
The probability of an randomly selected person quits a team is 0.125. Assume the team has n members. Determine the smallest n that the team needs to have if the probability of the team has at least 20 members left is 0.9.
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
the following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in
A sample of 9 customers is selected. What is the probability that exactly 2 customers in the sample will default on their payments?
A Business Week North American subscriber study collected data from a sample of 2861 subscribers. Fifty-nine percent of the respondents indicated an annual income of $75,000 or more, and 50% reported having an American Express credit card.
what is the formula of t-quantile distribution needed to calculate an exact 90 confidence interval for the
suppose we were interested in determining if there were differences in the average prices among two local supermarkets.
Suppose that 15% of all adults jog. An opinion poll asks a simple random sample of 500 adults if they jog. What is the sampling proportion in the sample who jog?
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