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Three groups of 5 students were tested in their ability to correctly answer a 10-question quiz under different formats. Group 1 had a True/False quiz, Group 2 had a Fill-In quiz, and Group 3 had a Multiple Choice quiz. Their scores were as follows:
True/False
Fill-In
Multiple Choice
6
3
8
5
10
9
7
Test whether there was a difference in performance on answering the same general questions under different formats. Use a .05 level of significance.
a) P-value = ________________
b) REJECT THE NULL or DO NOT REJECT THE NULL? (Circle one)
c) Can we conclude a difference in means? YES or NO (circle one)
d) If the null is rejected, which specific differences are statistically significant?
A typical problem statement is correlation research is _____________
Construct the 90% and 95% interval estimates for the population mean weekly sales.
Internal study by Technology Services department at Lahey Electronics disclosed company employees get the average of 2 emails per hour. Suppose arrival of these emails is approximated by Poisson distribution.
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho = 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Explain the value of test statistic using t distribution for the given value. Illustrate value of the t test statistic if you are testing a hypothesis.
If person is selected at random and tested, determine the probability of that person having an IQ score between 85 and 115. Make use of EXCEL to help determine the probability.
illustrate briefly how an experimental study is conducted. What is the difference between the two types of variables used.
A pediatrician is interested in studying the effect of Motrin on reducing temperature in young children. Four children with influenza have their temperatures taken immediately before and then 20 minutes after taking a standard dose
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
University of Waterloo are much susceptible to hypnosis which University of Tennessee undergraduates. Set up H0 and Ha for the test.
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
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