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Show an outer using scatter plot.
Bicycle helmet use. Table14.5 lists data from a cross-sectional survey of bicycle safety. The explanatory variable is a measure of neighborhood socioeconomic status (variable_RFM). The response variable is "percent of bicycle riders wearing a helmet" (P_Helm).
Percent of school children receiving free or reduced-fee lunches at school (variable P_RFM) and percent of bicycle riders wearing a helmet (variable P_HELM). Data for this study was recorded by field observers in October of 1994.
I (i)
School
P_RFM
P-HELM
1
Fair Oaks
50
22.1
2
Strandwood
11
35.9
3
Walnut Acres
57.9
4
Disc Bay
19
22.2
5
Belshaw
26
42.4
6
Kennedy
73
5.8
7
Cassell
81
3.6
8
Miner
51
21.4
9
Sedgewick
55.2
10
Sakamoto
33.3
Toyon
32.4
12
Lietz
25
38.4
13
Los Arboles
84
46.6
A good case can be made that observation 13 (Los Arboles) is an outlier. Discuss what this means in plain terms.
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
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Here are fifty observations on the weight of tea bags. Create mean, mode and median.
At the .01 significance level, is there a relationship between job pressure and age?
Explain clearly, in your own words, what is a Type I error in this context.
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
Determine the value of correlation coefficient between these 2 variables?
A pair of dice is rolled. What is the probability of each of the following? (Round your answers to three decimal places.)
A manufacturer of 35-mm cameras knows that a shipment of 30 cameras sent to the large discount store contains 8 defective cameras. The manufacturer also knows that the store will choose two of the cameras at a random, test them, and accept the shi..
Calculate expected number of interruptions per day. Calculate standard deviation.
The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
By using the fact that Martha believes the treatment will decrease the amount of time to fall asleep, describe the null and alternate hypotheses.
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