Questions and Answers of Essentials of Statistics

Using what you know about the expanded source table, fill in the missing values in the table shown here: df Source SS MS Gender 248.25 Parenting style 84.34 33.60 Gender X style Within 1107.2 36
Use these data—incidents of reports of underage drinking—to perform the following:“Dry” campus, state school: 47, 52, 27, 50“Dry” campus, private school: 25, 33, 31“Wet” campus, state
Use these €œenjoyment€ data to perform the following:a. Calculate the cell and marginal means.b. Draw a bar graph.c. Calculate the five different degrees of freedom, and indicate
What is a four-way within-groups ANOVA?
What is a factor?
What is a two-way ANOVA?
Explain why the standard error for the distribution of sample means is smaller than the standard deviation of sample scores.
How is the calculation of standard error different for a t test than for a z test?
Why do we modify the formula for calculating standard deviation when using t tests (and divide by N − 1)?
When should we use a t distribution?
Caroline Hoxby and Sarah Turner (2013) conducted an experiment to determine whether a simple intervention could increase the number of college applications among low-income students. The intervention
The table below provides information about hours of sleep.a. Calculate statistical power for a one-tailed test (a = 0.05, or 5%) aimed at determining if those in the sample sleep fewer hours, on
Your roommate is reading Fantasyland: A Season on Baseball’s Lunatic Fringe (Walker, 2006) and is intrigued by the statistical methods used by competitors in fantasy baseball leagues (in which
The research paper on culturally targeted therapy described in Exercise 8.59 reported the following: Across all 76 studies, the random effects weighted average effect size was d = .45 (SE = .04, p
A meta-analysis examined studies that compared two types of mental health treatments for ethnic and racial minorities—the standard available treatments and treatments that were adapted to the
A New York Times article reported on the growing problem of homelessness among families (Bellafante, 2013). The reporter wrote that families in a city-run program called Homebase had shorter stays
Calculate statistical power based on the data presented in Exercise 8.55 using the following alpha levels in a one-tailed test:a. Alpha of 0.05, or 5%b. Alpha of 0.10, or 10%c. Explain how power is
In several exercises in this chapter, we considered the study of one week of a college football season, during which the population of 53 FBS games had a mean spread (winning score minus losing
As in the previous exercise, assume the average speed of a serve in women’s tennis is around 118 mph, with a standard deviation of 12 mph. But now we recruit only 26 amateur tennis players to use
Let’s assume the average speed of a serve in women’s tennis is around 118 mph, with a standard deviation of 12 mph. We recruit 100 amateur tennis players to use our new training method this time,
According to the Nielsen Company, Americans spend $345 million on chocolate during the week of Valentine’s Day. Let’s assume that we know the average married person spends $45, with a population
In Exercise 8.51, you calculated an effect size for data from one week of a 2006 college football season with 4 games. Imagine that you had a sample of 20 games. How would the effect size change?
In Exercises 8.49 and 8.50, we considered the study of one week of a 2006 college football season, during which the population of 53 FBS games had a mean spread (winning score minus losing score) of
Using the football data presented in Exercise 8.49, practice evaluating data using confidence intervals.a. Compute the 80% confidence interval.b. How do the conclusion and the confidence interval
In an exercise in Chapter 7, we asked whether college football teams tend to be more likely or less likely to be mismatched in the upper National Collegiate Athletic Association (NCAA) divisions.
Let’s assume the average speed of a serve in men’s tennis is around 135 mph, with a standard deviation of 6.5 mph. Because these statistics are calculated over many years and many players, we
What is the difference between a between- groups research design and a within-groups research design?

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