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The following figures display data that depict the relation between students' monthly cell phone bills and the number of hours they report that they study per week.
a. What does the accompanying scatterplot suggest about the shape of the distribution for hours studied per week? What does it suggest about the shape of the distribution for monthly cell phone bill?
b. What does the accompanying grouped frequency histogram suggest about the shape of the distribution for monthly cell phone bill?
c. Is it a good idea to use a parametric hypothesis test for these data? Explain.
What kinds of statistical data might a burglar alarm company employ in trying to convince urban homeowners to purchase its product?
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
Females and males alike from the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college students indicated these results concerning the amount of time spent in volunte..
In a hospital study, it was found that the standard deviation of the sound levels from 20 randomly selected areas designated "casualty doors" was 4.1 dBA and the standard deviation of 24 randomly selected areas designated as "operating theaters" w..
use graphical sensitivity analysis to determine at what probability you are indifferent to d1 and d2?state of
Month is uniformly distributed between 2 and 12. Find the probability density function and the cumulative distribution function of x.
customers arrive at a two-chair shoeshin stand at the rate of 10 per hour. the average duration of a shoeshine is 6
If this poll had been based instead on 5000 adults, do you think the "95% confidence interval" would be wider or narrower than the interval given?
A population of scores forms a normal distribution with a mean of μ = 40 and a standard deviation of σ =12.
appleton cabinets inc. manufactures and installs custom designed cabinets and counter tops for kitchens and bathrooms.
What is your conclusion regarding the significance of the factors or their interactions? Test at the 5% level of significance.
At the 5% level of significance, test whether the proportion of internet users paying bills online is now more than 50%.
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