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People who wrote about a time when their lives were unfair did report being more angry after writing the essay (M = 2.05, SD = 1.18) than did people who wrote about a time when they were bored (M = 1.34, SD = .77), t(103) = 3.64, p < .001
1. Bold descriptive statistics and underline or highlight inferential statistics.
2. List test statistic _____ ____, p value ______
3. What decision should the author make about the null hypothesis (i.e., retain or reject)?
4. What are two possible interpretations?
Draw a negatively skewed distribution.- What does it indicate if a participant has a z-score of 2.5? -.80? .OO?
A 1-minute television ad costs $30,000 and 1- minute radio add costs $5,000. French Enterprise should decide how many television ads to buy. Write down the decision variables?
Use your calculator to find the mean and standard deviation for the 9 observations that remain when you leave out the outlier. How does the outlier affect the values of x and s? Is s a resistant measure of spread?
Suppose a point in two-dimensional Cartesian space, , is equally likely to fall anywhere on the semicircle. - Find the PDF of Y.
With a mean of 300 and a standard deviation of 80, how high a score do you need to be in the top 30%?
What is the population of interest?- What is the population parameter of interest?- What is the sample?- What is the value of the sample statistic?
the scores on a hypothetical vocabulary test of a group of 20 year olds and a group of 60 year olds are shown below20
Suppose that payments are to be made quarterly. Find the present value if: (a) the first payment is to be made at age 70; (b) the first payment is to be made at age 70 1.
statistics released by the national highway safety administration show that on an average weekend night in urban areas
Carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
In order to run most multivariate analyses, it is not necessary to meet all the assumptions of normality, linearity, homoscedasticity, and independence.
After a large number of flips, the overall proportion of heads "settles down" to nearly what value?
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