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Keep in mind that certain distributions, such as exam scores or some physical characteristics for specific age and gender groups, naturally follow a normal shape. Other distributions are naturally skewed left or have low outliers if there tend to be relatively few values that are unusually low compared to the rest. Yet other distributions are naturally skewed right or have high outliers if there tend to be relatively few values that are unusually high compared to the rest. Decide if each of the following variables is most likely to have a shape that is approximately normal, or skewed left/low outliers, or skewed right/high outliers:
a. Number of minutes that students spend on the computer on a given day
b. Number of minutes that students spend on the phone on a given day
c. Verbal SAT scores
d. Number of cigarettes smoked in a day by a large group of students who smoke
e. Amount of cash carried by students
f. Heights of students' fathers
g. Ages of students' mothers
h. Number of hours that students slept on a given night in a large group of students that includes a few who got little or no sleep
Evaluate the mean wait time and throughput rate
Clairol maintains that more than 72% of women in the US use some type of hair coloring on their hair. You work with a local beauty shop.
The quality-control inspector checks 200 pieces in a certain operation. The piece is either good or defective. The record for nine hours.
To test whether the population standard deviation differ significantly using Chi-Square test.
The figures show the number of Iraq casualties through October 2009 and the population of some hometowns .
Stratified sampling of forest areas. Stratified samples are widely used to study large areas of forest. Based on satellite images, a forest area in the Amazon
Let A be a 3 × 4 matrix. B be a 4 × 5 matrix, and C be a 4 × 4 matrix. Determine which of the following products are defined and find the size of those that are defined.
Pizza prices. The histogram shows the distribution of the prices of a small, plain pizza (in $) for 156 weeks in Dallas, Texas.
Suppose that the target response rate was 4% when the current mailing was sent to the 20,000 people in the donations database on the companion site.
a. Construct an ordered stem and leaf display to sort the data. b. After examining the stem and leaf display prepared in a., comment on the possible distribution of the number of cases purchased by the supermarket chain.
Under what conditions, if any, is it not correct to assume that the sampling distribution of the sample mean is approximately normally distributed?
a researcher conducts an experiment on the iq of twenty-five randomly selected only children and dinds that their
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