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In a sample of 440 adults, 268 had children. Construct a 99% confidence interval for the true population proportion of adults with children.
Give your answers as decimals, to three places
Suppose that 15% of the population is left-handed. If 20 people are selected at random, find the probability that exactly 4 of them are left-handed.
q1. in a study of the effects of stress on illness a researcher tallied the number of colds people contracted during a
A restaurant owner is concerned about the consistency of business. He wants to determine if the standard deviation of the profits for each week is less.
At the 0.05 level of significance, can we reject the possibility that the interviewers are equally capable of obtaining interviews?
What are the minimum value and the maximum value? List the actual values in the fourth row. List the actual values in the second row. How many values are less than 70? How many values are 80 or more?
A consumer organization wants to know if there is a difference in the price of a particular toy at three different types of stores. The price of the toy was checked in a sample of five discount toy stores, five variety stores, and five department ..
You are given the choice of three doors. Behind one is a new car and the others hide a barnyard animal for you to keep. After you choose door number one, your host (Monty) opens door three to reveal a goat.
Suppose that the monthly sales of a dealer of a certain luxury car constitute a conditional Poisson process such that A is a discrete random variable taking the values 2, 3, or 4, with probabilities 1/4, 1/2, and 1/4, respectively.
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
Calculate the following percentages for a z score of 0.74, with a tail of 22.96%: What percentage of scores falls between the mean and this z score?
b. For each treatment, plot the residuals against the fitted values. Also prepare a normal probability plot of the residuals and calculate the coefficient of correlation between the ordered residuals and their expected values under normality. Wha..
reasearchers for a manufacture of barometers reach each of 50 barameters at the same time each day. the mean of the
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