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Researchers wanted to explore self-esteem in adolescent boys and girls. They used a 5 point Likert-type self-esteem inventory; 1=strongly disagree and 5= strongly agree. What if their results yielded the following: t=1.71, d=.90. What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and girls? What was the purpose of calculating a Cohen's d? When is a Cohen's d calculated? Interpret d=.90. What does it mean in this example?
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
In order not to violate the requirements necessary to use the chi-square distribution, each expected frequency in a goodness of fit test must be:
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
Find a 90% confidence interval for the population mean weight of all such turtles.
The analysis of covariance (ANCOVA) is generally useful for _______________
The Wilcoxon rank sum of the ranks for group and The value of the Wilcoxon signed rank statistic
Make a histogram for the r probability distribution.
Make up a scatter diagram with 10 dots for each of the following:
By using the normal distribution to approximate the desired probability.
Use a 0.05 significance level to test the claim that king-size cigarettes with filters have a lower mean amount of nicotine than the mean amount of nicotine in non-filtered king-size cigarettes.
In the solution to this problem, what is n? p? q? Does it appear that both np and nq are larger than 5? Why is this an important consideration?
Make use of normal probability distribution features of EXCEL to help determine the probability.
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