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The highway department is interested in the proportion of vehicles on Interstate 35 between the hours of midnight and 5:00 a.m. that are 18-wheel tractor trailers. It has been found that this proportion is about 26.63%. If a random sample of 288 vehicles is taken, then what is the probability that between 27 percent and 33 percent of these vehicles will be tractor trailers?
q1. a researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems.
A research group compared probiotics with antibiotics to know the best way to treat diarrhea. It showed that consumption of probiotics was a better way.
Qoestion 1: A researcher is interested in the effects of gender on alcohol use. What is the independent variable(s)? Question 2: A researcher is interested in the effects of gender on alcohol use. What is the dependent variable(s)?
a researcher believes exercise reduces anxiety in women. she identifies a group of women who had not exercised before
Who are the owners of a public firm? Are the owners shareholders, bondholders, employees or managers?
When doing hypothesis testing we have two ways of making a decision - the critical value method and the p-value method. While both give the same results in terms of determining whether to reject or not reject the null hypothesis
What effect would that have on a 95% confidence interval for, say, the mean cost of housing? Specifically, which values used in the formula for the margin.
Prepare a table showing sales, a time trend, and dummy variables to take into account seasonal effects. (b) Using the data from the table in part
Define the following graphical methods and describe how they are used- Histogram and Relative frequency histogram
question 1 a two-way anova model was used to analyze an experiment with two levels of one factor three levels of a
The mean is 75 and the standard deviation is 6. If 1200 students took the test, approx how many students would be expected to score between 69 and 81?
In the FBI promotion system, last year's decoration points had a standard deviation equivalent to 7.1. This year 27 of the tested individuals had scores with a standard deviation of 4.2.
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