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Random and independent samples of 80 recent prime time airings from each of two major networks have been considered. The first network aired a mean of 110.7 commercials during prime time, with a standard deviation of 4.6 commercials. The second network aired a mean of 109.3 commercials, with a standard deviation of 4.4commercials. As the sample sizes are quite large, the population standard deviations can be estimated using the sample standard deviations. Construct a 95% confidence interval for, the difference between the mean number of commercials aired during prime time by the first network and the mean number of commercials aired during prime time by the second network. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. (If necessary, consult a list of formulas.)
(a) Test the hypothesis that H0 : μ = 44 vs. Ha : μ /= 44 using α = 0.10. Draw a box plot and normal plot for this data, and comment. (b) Find a 90% con?dence interval for the population mean μ. (c) Discuss the meanings of (a) a..
Gestational Age (Gestage, weeks) for sample of 100 low birth weight infants, and output from fitting a simple linear regression model to data, regressing Headcirc (Y) on Gestage (X).
Refer to the simple linear regression relating number of employees y to age x of a fast-growing firm, Exercise 9.21 (p. 487).The SAS printout is reproduced on the next page.
question trains arrive at a station at the rate of 25 per hour.a what is the probability that the time between trains
waiters at finegolds restaurant and lounge earn most of their income from tips. each waiter is required to tip-out a
Do the data contradict the hospital's claimed mean value per inventoried item and indicate that the average is less than $300? Use a = .05.
Experience indicates that 30% of the people entering a store make a purchase. Using (a) the binomial distribution and (b) the normal approximation to the binomial, ?nd the probability that out of 30 people entering the store, 10 or more will make ..
If there is one-year warranty on the equipment, what proportion of the customers will actually make a valid warranty claim?
A contractor is responsible for drainage network cleaning and shall ensure that the required level of service is achieved. The required level of service is that any point in time no more than 3% of Drainage Inlet pits and no more than 3% of Drains ar..
Find out optimal assignment and calculate total minimum cost.
Estimate of 3 days, a most likely time estimate of 8 days, and a pessimistic time estimate of 10 days - estimate of 6 days. and a pessimistic time estimate of 10 days.
Determine the regression equation for predicting scholarly productivity (Y) from institutional comprehensiveness (X). For an institution with a comprehensiveness score of 175, predict the psychology department's scholarly productivity score
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