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In an experiment on magazine advertisements, a researcher is examining visual displays to determine if one is more memorable. Only a small number of subjects will be avaliable for study. Should the
To find the sample size needed for a hypothesis test, if Ho: mu=10, Ha: mu<10, sigma is unknown, alpha = 0.01, beta = 0.05 and E = 0.80(sigma), find:
When conducting a hypothesis test with chi-square analysis, the null hypothesis is rejected when the differences between the expected and observed frequencies are relatively large.
Do you have sufficient evidence to conclude that the mean amount of caffeine consumed dsily by college students is less than 250mg? (Enter yes or no)
It is estimated that there are 30 depths for every 10 million people who use airplanes. a company that sells fight insurance provides $100000 in case of depth in a plane crash. a policy can be purch
A sample of 850 people resulted in a confidence interval estimate for the proportion of people who believe that the Fed. Gov.'s proposed tex increse is justified is between .14 and .20. Based on t
A fair coin is tossed 500 times. Find the probability of obtaining more than 300 heads.
A multiple-choice test consists of 77 questions with possible answers of a, b, c, d, e. Estimate the probability that with random quessing, the number of correct answers is at least 33.
An airline company is considering a new policy of booking as many as 178 persons on an airplane that can seat only 170. Past studies have revealed that only 84% of the booked passengers actually arr
About 34% of Americans have type A+ blood. A blood drive gets 140 donors. What is the probability that at least 40 of them are A+ blood donors?
It is estimated that 56% of the children between the ages of 3 and 5 years are already enrolled in school. In a sample of 150 children what is the probability that exactly 100 are enrolled in school
A fair coin is tossed 20 times and x=6 heads are observed. Let p=P(head). A test of Ho:p=.5 versus Ha: p<.05 is to be performed based upon the results of the 20 tosses. What is the p-value for th
In a past election, the voter turnout was 51%. In a survey, 843 subjects were asked if they voted in the election. Find the mean and standard deviation fot the numbers of voters in groups of 843.
Suppose that x1, x2, x3, x4, and x5 is a random sample from a distribution with density function: f(x) =1/theta for 0<x<theta. The null hypothesis theta=1 is to be tested against the alternati
If an exercise scientist wants to estimate the proportion of American adults who exercise for 30 minutes three or more times per week. He wants to construct a 90% confidence interval with a margin o
Steve and his friends are relaxing at a local tavern. The number of drinks that Steve's table receives is Poisson distributed with an average of 9 drinks per 3 hours. Write out the distribution and
In a study of the effectiveness of garlic for lowering cholesterol, 17 subjects were treated with Garlicin, which is garlic in a processed tablet form. The measurement of interest is the change in L
You earned a 7.1% nominal rate of return on your investments over the past year. But at the same time, the reported inflation rate was 3.1%. What was your real rate of return for the year (the perce
Explain how do you declare a variable as Binary or Integer in Excel Solver? 1.Briefly explain the results of a What-If analysis of the following LP model,
Find the mean and standard deviation for the number of times this letter will be found on a typical page of 3300 characters.
The time, T, between emissions radioactive emissions has an eponential distribution with a mean of 4 seconds between emissions. What is the parameter lambda of the exponetial distribution?
Several psychology students are unprepared for a surprise true/false test with 11 questions, and all of their answers or guesses. Find the mean and the standard deviation for the number of correct a
A sample of 850 people resulted in a confidence interval estimate for the proportion of people who believe that the Fed. Gov.'s proposed tex increse is justified is between .14 and .20. Based on thi
One environmental group did a study of recycling habits in a California community. It found that 70% of the aluminum cans sold in the area were recycled.