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1.) The number of credits being taken by a sample of 12? full-time college students are listed below. Find the? mean, median, and mode of the? data, if possible.
11 12 12 9 8 8 8 10 8 8 9 6
2.) The ages? (in years) of a random sample of elementary school kids are shown. Determine the? range, variance, and standard deviation of the sample data set.
6 8 7 9 6 5
3.) A modified boxplot is a boxplot that uses symbols to identify outliers. The horizontal line of a modified boxplot extends as far as the minimum data entry that is not an outlier and the maximum data entry that is not an outlier.? (a) Identify any outliers and? (b) draw a modified boxplot that represents the data set. Use a cross ?(times ×?) to plot any outliers.
52
9
39
51
58
54
95
88
62
30
45
61
48
63
78
37
43
91
Identify any possible outliers.
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
An independent-measures research study was used to compare two treatment conditions with n = 4 participants in each treatment. The first treatment had a mean of M = 58 with a variance of s^2 = 28, and the second treatment had M = 52 with s^2 = 36.
Ben conducts a study on the effects of actor gender on purchasing preferences. He shows participants a video in which either a male or female actor promotes a new XBox game. Ben then has participants (all parents) rate the game, using a scale of 1-..
The chief of police claims that response time has improved. Is there any evidence to suggest that the mean police response time has decreased?
Senator Barbara Boxer's arguments for the protection of wilderness areas should be ignored. Boxer is just another one of those tree-hugging liberals.
Identify the types of measurements used in the study. Which of the statistics presented, provides the most compelling evidence to support the author's position?
Find out if a difference between two response sets is significant. I asked 98 boys what modalities they thought were attractive to girls. 35 said athletes; 25 said tough guys. The rest endorsed other modalities at lesser rates.
It costs $3 to fix each defect. What is the expected cost and the standard deviation of cost of fixing a defect in a product?
Which type of interval should you use to learn about the mean spending habits of your typical customer?
The box of Yvette's favorite cereal states that the net contents weigh 12 ounces. Yvette is suspicious of this claim because the package never seems.
Dr. Jones, the history professor, administers a 30-item test the first day of class to ascertain his students' initial level of knowledge of American history
In 2009, the average fee paid by H&R Block tax preparation customers was $187. Assume that the standard deviation of fees was $60 but that we have no idea regarding the shape of the population distribution.
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