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suppose that as reported by the centers for disease control about 30% of high school students smoke tobacco. you randomly select 120 high school students to survey them on their attitudes toward scenes of smoking in the movies.
a) The number of smokers among 120 randomly selected students will vary from group to group. Explain why that number can be described wit a normal model.
Calculated test statistic at the 5% level of significance and An airline claims that 65% of its flights depart on time.
Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study to the Discussion Area.
A tetrahedron is a fully-symmetric pyramid-like solid, with four faces made up of equal-sized equilateral triangles. Suppose that the four faces contain different number of spots, from one spot to four spots, so that the tetrahedron may be rolled ..
According to a recent survey, Americans get a mean of 7 hours of sleep per night. A random sample of 50 students at West Virginia University revealed the mean number of hours slept last night was 6 hours and 48 minutes
A) Resistant statistics should always be used. B) Resistant statistics should be used when the data is not bell-shaped. C) Sensitive statistics should be used when the data is not bell-shaped. D) Sensitive statistics should always be used. E) Resista..
Determine the p-value; and at 93.7% confidence, test the above hypotheses.
The company investigating the golf balls is not satisfied with the limited analysis that it has done. The managers have collected a good deal of data, but they are not sure how to look at them and interpret the output.
Probability based on normal distribution. Suppose among X has a normal distribution, and find the indicated probability.
Normal with mean 48 months and standard deviation 9 months. The company has decided to give a guarantee for the sensors for 3 years. What % age of the sensors will not satisfy the guarantee.
If a 99% confidence interval is calculated to estimate the difference between the average hourly rates for each type of graduate, what is the margin of error? Assume both population standard deviations are equal.
What is the probability density function for this uniform distribution?
Set up hypotheses and carry out all relevant tests. Describe all results and implications which you have discovered.
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