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4. A cable TV company wants to estimate the percentage of cable boxes in use during an evening hour. An approximation based on previous surveys is 25 percent. The company wants the new estimate to be at the 90 percent confidence level and within 2 percent of the actual proportion. What sample size is needed?
5. Suppose that 60 percent of the voters in a particular region support a candidate. Find the probability that a sample of 1,000 voters would yield a sample proportion in favor of the candidate within 3 percentage points of the actual proportion.
Which chart indicates the trend in forecast values as a particular decision variable is varied
A linear regression equation is computed for a sample of n = 18 pairs of X and Y scores. For the analysis of regression testing the significance of the equation, what are the df values for the F-ratio?
Estimate the mean height of females in the health profession. Use the given population standard deviation of 2.75 inches.
a two stroke four cylinder ideal otto engine operates at 4800rpm. air is taken in at 101 kpa and 20 centigrade. the
Use of academic assistance services. Use a goodness-of-fit test to examine how well your university reflects the national average
Select the answer for each question. What type of probability distribution can be used to figure out her chance of getting 10 questions right?
A study is conducted to estimate survival in patients following kidney transplant. Key factors that adversely affect success of the transplant include advanced age and diabetes. This study involves 25 participants who are 65 years of age and older..
Do a frequency table, histogram, normal Q - Q and the de-trended normal Q-Q for each one of the 11 variables and what does the significance value reveal about the data we have used?
A machine produces safety devices for use in helicopters. A quality-control engineer regularly checks samples of the devices produced by the machine.
From their findings, Amazon found that 30% of their customers who make a purchase also purchase an add-on product from that feature. Assuming this is true, use the binomial distribution table to determine the probability that in a random sample of..
Let the independent r.v.'s X1,. .., Xn be distributed as U(0, 1), and let 1 j n. Use the relevant results in Example 3, and Exercise 1.6(i) in order to derive: i) The conditional p.d.f. of Yj, given Y1;
For a hypothesis comparing two population means, what is the critical value for a one-tailed hypothesis test, using a 5% level of significance level, with both sample sizes equal to 13? Assume the population standard deviations are equal.
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