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Data from a national survey of college students living away from home indicate that freshman go home an average of 1.7 times per month. A simple random sample of 121 UMD students living away from ho
A researcher wants to know if the amount of calories in a meal from five different restaurants is different. What type of statistic should be used?
Describe an alternative to counterbalancing as a means of controlling confounding variables. Give an example to back up your answer.
Why is the repeated measures ANOVA usually a more sensitive test of the relationship between the independent and dependent variables than is a between-subjects ANOVA?
Salt-free diets are often prescribed to people with high blood pressure. The following data values were obtained from an experiment designed to estimate the reduction in diastolic blood pressure as
Surveys have become an important component of American life. They directly affect us in so many ways, including public, policy, the television shows we watch, the products we buy, and the political
Suppose three fair dice are rolled at the same time. a) What is the probability that at least one number will be less than 5?
Which of the following best describes the sample: Confidence, simple random sample, random sample, voluntary response, stratified sample, or cluster sample.
Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in 2013. Suppose a sample of 100 major league players was taken. Find the approximate probability tha
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
There is a 0.0724 probbability that a best-of-seven contest will last four games, a 0.2115 probability that it will last five games, a 0.2747 probabilty that it will last six games, and a 0.4414 pro
If a person bought one share of Google stock within the last year, what is the probability that the stock on that day closed within $45 of the mean for that year? Hint: Find two z scores and use the
The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the nu
A researcher wants to determine a 97% confidence interval for the mean number of hours that UIUC students spend doing homework per week. Suppose she know that the standard deviation for hours spent
Tests of the fidelity and the selectivity of 190 radios produced the results shown in the following table: Use the 0/01 level of significance to test the null hypothesis that fidelity independent of
Certain radioactive substance is a random variable having the Poisson distribution with lambda = 2.4. Use the following data obtained for 300-1 second intervals to test this null hypothesis at the 0
We randomly choose letters, one at a time, without replacement, from the word, CHOOSE until both Os have been obtained. Find the variance of the random variable.
Use a suitable statistical computer program to test whether the mean failure time of such light bulbs is significantly less than 300 hours. Use the 0.01 level of significance.
Find the 98% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of fr
Suppose a linear programming (maximization) problem has been solved and the optimal value of the objective function is $300. Suppose a constraint is removed from this problem. Explain how this might
You claim that the average speed of cars going down a certain stretch of highway is 72 mph. After analyzing the data and performing a hypothesis test, you fail to reject the null hypothesis.
We randomly choose letters, one at a time, without replacement, from the word CHOOSE until both Os have been obtained. What is the variance of the random variable? The answer should be 14/9.
Test the claim that Sludge County has a pinworm infection rate that is greater than the national average. Use a 0.01 significance level.
For the binomial distribution with the given values for n and p, state whether or not it is suitable to use the normal distribution as an approximation.
What is the probability the average of the sample is more than $37000 if a random sample of 75 house holds is taken?