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Illustrate all the work and compute step by step
1. A researcher performs the independent -measures research study and obtains t =2.070 with df= 28.a. How many individuals participated in entire research study?b. Using two-tailed test with α = .05, is there significant difference between two treatment conditions?c. Calculate r2 to measure percentage of variance accounted for by treatment effect.
State the alternate hypothesis for this study? What critical value should be used to determine the rejection region? Use the 1 proportion Z-test.
Marie claims she can predict the sex of pregnant women's babies for first-time new mothers. She sees 1000 women a year, and she always predicts a female. She charges $1000 for a prediction
Suppose that a survey is being planned for purposes of estimating the average number of hours spent exercising daily by adults (18 years of age or older) living in a certain community.
Identify a key variable that you want to predict, and specify at least two variables that you think would be key in making that prediction.
The cholesterol concentration in the yolks of each of a sample of 22 randomly selected eggs laid by free range chickens were found to have a mean value of 9.38 mg/g of yolk and a standard deviation of 1.62 mg/g.
All standard IQ test scores are normally distributed and are set up so that the mean score is 100. However, the standard deviation differs from test to test.
What are post hoc comparisons, and why do researchers make them? Why do researchers not use the Bonferroni procedure of procedures for post hoc comparisons?
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
A cereal manufacturer seeks to test their newest product against competitor's. A group of 100 children was asked to measure each brand, and then to express a preference.
Make up the ages of a group of participants who are freshman, sophomores, juniors, and seniors. You will need the age of 10 participants across each level.
Suppose that beer consumption and religious affiliation are not independent of each other. That means that
Find out point estimate and 95% confidence interval for mean family dental expenses of all employees of company.
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