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The principal of a charter school in Tampa believes that the IQs of its students are above the national average of 100. From the past experience, IQ is normally distributed with a standard deviation of 10. A random sample of 20 students is selected from this school and their IQs are observed. The following are the observed values.
95 91 110 93 133 119 113 107 110 89113 100 100 124 116 113 110 106 115 113
(a) Test for the normality of the data
(b) Do the IQs of students at the school run above the national average at α = 0.01?
An independent financial advisor claims an average rate of return, μ, on a particular investment is at least 7%. In testing her claim, the correct pair of hypotheses is:
a company that manufacturers coffee for use in commercial machines monitors the caffeine content in its coffee. the
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
suppose the average speeds of passenger trains traveling from newark new jersey to philadelphia pennsylvania are
At a significance level of 0.05, does the sample provide sufficient evidence to support your claim?
Display the data in scatter plot. Calculate the linear correlation coefficient. Use the scatterplot to make a conclusion about the type of correlation.
Employees of a local company are classified according to gender and job type. The following table summarizes the number of people in each job category.
Management wishes to test whether each shopper is spending an equal amount of money at each store. Calculate the sums of squares SS(total), SS(factor), and SS(error)
Find out the coefficient of determination, r 2 , and interpret its meaning.
The researchers planned to use simple linear regression to see if the age at which a baby was first able to crawl could be predicted from the average outdoor temperature six months after each baby's birthdate.
question bombardier of montreal.bombardier designs and manufactures trains and planes and relies on large deals from
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