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Assume for the sake of this question that GRE scores are normally distributed with a mean of 1000 and a standard deviation of 200. What percentage of students taking the exam will get scores of 1400 or higher?
Develop percent frequency distribution and construct bar chart and pie chart.
A sample of 60 students from a large university is taken. The average age in the sample was 22 years with a standard deviation of 6 years.
When trying to understand the stroke data, what would be the advantage of looking at a histogram instead of this frequency distribution?
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? What is the p-value?
Nicotine patches are often used to help smokers quit. Does giving medicine to fight depression also help? A randomized double blind experiment assigned 244 smokers to receive nicotine patches and another 245 to receive both a patch and the antidep..
Based on these data, determine the 95 percent confidence interval estimate for true population mean?
A new restaurant with 123 seats is being planned. Studies show that 57% of the customers demand a smoke free area. How many seats sould be in the non-smoking area in order to be very sure (mean+3StandardDeviation) of having enough seating there?
In a certain college, 20% of the physics majors belong to ethnic minorities. If 10 students are selected at random from the physics majors, what is the probability that exactly 2 belong to an ethnic minority?
The mean heart rate is 90 beats per minute with a standard deviation of 5. Find the 98% confidence interval for the true mean heart rate of all people with this untreated condition.
A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40.0 hours. You believe this figure is too large and decide to conduct your own test.
Faced with rising fax costs, a firm issued a guideline that transmissions of ten pages or more should be sent by two-day mail instead. Exceptions are allowed, but they want the average to be ten or below. Use Excel to find the right-tail p value
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