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If the top 15% of the test scores are usually good enough for admission to law school, find the cut off score for gaining admission.
A survey of 94 students found that 23% were in favor of raising tution to build a new math building. The standard deviation of the sample proprortion is 5.3%. How large a sample (to the nearest pers
When viewing things online all I could find was that if the p-value was greater than .05 then the null hypothesis was accepted? Is that a correct assumption or does it vary by example?
how many waiters and busboys should report for work at the start of each time period to minimize the total staff required for one day's operation. (Hint: Let X1 equal the number of waiters and busbo
The standard for elevated adult DBP- as the cutoff. What percentage of 17-year-old-boys would be found to have elevated blood pressure, using this approach?
If you select a random sample of n=100 what is the probability that the sample mean will be between $275,000 and $290,000?
The U.S. Census Bureau publishes data on factory orders for all manufacturing. Use these data to develop forecasts for the years 1992 through 1999 using a 5-year moving average.
The time within the first 4 hours; of the animals alive at 4 hours, 10% will die in the next 4 hours. What is the probability that 2 rats will die in the 8 hour period?"
Assume that the statistician also gave us the information that the distribution of the serve speeds was bell shaped. What proportion of the player's serves are expected to be between 107 mph and 118
The mean SAT verbal score is 412, with a standard deviation of 90. Use the Empirical Rule to determine what percent of the scores lie between 412 and 592. (Assume the data set has a bell-shaped dist
Identify and briefly describe an important process in your workplace, including selection of one key quantitative variable, that you (and others in your organization) consider an important metric.
About 74% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
A sample of n = 25 scores has a mean of M = 40 and a variance of s2 = 100. If this sample is being used to test a null hypothesis stating that m = 43, then what is the statistic for the sample?
Identify your research question, your research (alternative) hypothesis, and your null hypothesis. Also, identify your independent and dependent variable.
At a 80% level, how many elephants need to be weighed so the average weight will be accurate to within 350 pounds?
Suppose a sample of size n = 100 is assumed to be IID having the Gam(alpha, lambda) distribution and the method of moments estimators of the parameters are alpha(hat)= 5.23 and lambda(hat) = 21.3. F
Develop a point estimate of the proportion of funds that are classified as high risk. c) develop a point estimate of the proportion of funds that have a below-average risk rating.
About 73% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
Is there a difference in the number of points students earned on their educational statistics pretests and posttests?
If a statistician designs a house so that all of the doorways have heights that are sufficient for all men except the tallest 5% what doorway height would be used?
How many trucks and vans should they produce each week to maximize profit and remain within the stated bounds?
32 packages are randomly selected from packages reveived by a parcel service. The sample has a mean weight of 23.0 pounds and a standard deviation of 1.9 pounds. What is the 95 percent confidence in
You buy tow hitch balls in large lots for the tow tractors you manufacture. What price per ball should you pay to minimize total cost?
A random sample of 101 light bulbs had a mean life of x=481 hours with a standard deviaiton of s=30 hours. Construct a 90 percent confidence interval for the mean life, u, of all light bulbs of this
Daily demand rate for the units is 60 per day. What is the most economical number to produce per production run?