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The college is planning to add a food vender in the student union and would like to know what type of food service the students would prefer. A sample of 60 students is obtained and each student is
Do students taking the supplement have significantly worse fitness scores? Use a one?tailed test with alpha = .05.
Each of the 110 students in a statistics class selects a random sample of 35 Quiz scores from a population of 5000 scores. They are not given the population mean and standard deviation. Using these
A sample of 344 subscribers of time magazine shows the mean time spent using the internet is 14.4 hours per week, standard deviation of 7.5 hours, 95%confidnece interval, what was the standard error
Suppose that a random sample of 41 state college students is asked to measure the length of their right foot in centimeters. A 95% confidence interval for the mean foot length for students at this u
In Sunday's Indianapolis Star, there was an artcle talking about all the new grocery stroes opening in Indy. One of the reasons that Indianapolis is so competivtive is because of the amount we spend
A fan index is caluclated for each of the professional sports to give an idea of what it costs for a family to go to a game. She sampled 20 teams from 2012 NFL and found the average cost index t
Calculate the mean of the sampling distribution of sample means. How does this compare to the mean of the population? How should these two compare?
What is the 95% confidence interval for u, the population mean time the postal service employees have spent with the postal service?
The state criminology lab must sometimes estimate a person's height from partial skeleton remains. A random sample of eight adult male X-rays gave the following information, measured in inches:
State null and alternative hypothesis of interest for this problem and compute the test statistic. Compute the P-value associated with this test and discuss whether its value shows evidence against t
If there is a strong negative linear relationship between the variables, the value pf r will be close to what value?
What is the confidnence interval estimate of the population mean?
Is this a: simple random, samplestratified sample, systematic samplecluster sample or convenience sample?
Thirteen percent of the adult population is left-handed. Of the first 44 presidents of the United States, seven are left-handed. Is there evidence that the presidents represent a biased sample of th
A professor has written 6 different versions of an online test, for security reasons. Students are randomly assigned any one of the tests when they sign in to take it.
Police response time to an emergency call is the difference between the times the call is first received by the dispatcher and the time a patrol car radios that it has arrived at the scene. over a l
Five years ago the standard deviation of the ages of the undergraduate business students was 1.5 years. Recently a sample of 26 such students had a standard deviation of 2.0 years. We are interested
We are interested in testing whether the standard deviation of a population 1 is significantly greater than the standard deviation of population 2, at a 5% significance level. The sample sizes are:
At a 0.01 significance level can we conclude that the mean speed of all vehicles at this location is greater than 65 miles per hour? Assume a population standard deviation of 7.8 miles per hour. Wh
Sarah takes a random sample of 50 girls at her high school and finds the average number of text messages is 106. Do you think the average number of text messages girls send at sarah's high school is
What results in your departments seem to be correlated or related to other activities? How could you verify this? Create a null and alternate hypothesis for one of these issues. What are the manager
When one variable precedes the other in time and the correlation between them is high, which statement can be made with confidence?
X is a normally distributed random variable with a mean of 5.0. Find the standard deviation of the distribution if 59.10% of the data lies to the right of 4.54.
One way to establish validity of a questionnaire is my measuring: