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Professor Fair believes extra time does not improve grades on exams. He randomly divided a group of 300 students into two groups and gave them all the same test. One group had exactly 1 hour in which to finish the test, and the other group could stay as long as desired. The results follow. Test at the .01 level of significance that time to do a test and test results are independent.
A student scores 91 on the midterm exam for physics. Assume the class scores are normally distributed, with a mean of 65 and standard deviation of 15. Into what percentile does this student fall?
the average number of vacation days per year offered by different us companies is skewed to the right. a random sample
According to an IRS study, it takes an average of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time ..
Frequencies of Responses in the Five Categories of the Self-Reported Bullying and Victimization Variables at Wave 3
question in a study of air-bag effectiveness it was found that in 821 crashes of midsize cars equipped with air bags
If measurements are made over span of 9 months, and results are averaged, find out the probability that neighbourhood is considered unsafe?
In an online survey of 4001 respondents, 8% were classified as productivity enhancers who are comfortable with technology and use the internet for its practical value. Suppose you select a sample of 400 students at your school, and the population ..
The value of the test statistic
What would be the most appropriate graphical representation to show the dispersion of new home prices in a particular area? Why?
Find the probability of getting all girls. Find the probability of getting at least one child of each sex. Find the probability of getting exactly two children of each sex.
Florida State University administers a test of mathematics placement to students when they first enter the university.
How do you set up SPSS to find descriptives for the perceived learning variable for each gender?
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