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A behavioral scientist measures attention in a sample of 31 participants. To measure the variance of attentionI she computes 55 = 120 for this sample.
a. What are the degrees of freedom for the variance?
b. Compute the variance and the standard deviation.
Could this information be viewed as representing the nominal scale of measurement? If so, explain your reasoning. If not, why not?
Construct a stem-and-leaf plot using the whole numbers as the stems. What advantages does the stem-and-leaf plot of these sales figures offer over the histogram
To better understand eating patterns that might contribute to obesity, a researcher measures the average number of calories (per meal) consumed by shift worker.
Estimate the number of visitors in the sample that are actually looking for Billy's truck repair website by giving the mean of the relevant distribution
Measurements made on the internally compensated amplifiers listed below provide the dc gain and the frequency at which the gain has dropped by 20 dB. For each, what are the 3 dB and unity-gain frequencies?
The researchers built a model for predicting winning time (y) of the marathon as a function of year (x1) in which the race is run and gender (x2) of the winning runner. Classify each variable in the model as quantitative or qualitative.
Can we reject the psychologist's claim that the proportion of married couples for whom her program can prevent divorce is at least 76%?
A simple random sample of kitchen toasters is to be taken to determine the mean operational lifetime in hours. Assume that the lifetimes are normally distributed with population standard deviation hours.
Describe the steps in the procedure for testing hypotheses. Discuss the difference between a null hypothesis and an alternative hypothesis.
A box contains $340 in ten bills: four ten-dollar bills and six ?fty-dollar bills. Suppose we pick three bills at random from the box without replacement.
1. determine if this study is experimental or observational researchers monitor the health of smokers and
the united states department of agriculture reports that the mean american consumption of carbonated beverages per year
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