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An enterprising art historian recently started a new business: the production of walking-tour audiotapes for use by those visiting major cities. She originally pro- duced tapes for eight cities: Paris, Rome, London, Florence, Jerusalem, Washington, New York, and New Haven. A test was carried out to determine whether all eight tapes (featuring different aspects of different cities) were equally appealing to poten- tial users. A random sample of 160 prospective tourists was selected, 20 per city. Each person evaluated the tape he or she was given on a scale of 0 to 100. The results were analyzed using one-way ANOVA and included SSTR = 7,102 and SSE = 10,511. Are all eight tapes equally appealing, on average? What can you say about the p-value?
A random sample of n = 4 scores is selected from a population with µ = 80 and σ = 20. On average, how much difference would you expect between the sample mean and the population mean?
You wish to compare how a low-fat diet, low-fat diet and a brisk four-mile walk each day, and a low-fat diet and a four-mile job each day affect cholesterol levels. You randomly assign six subjects to each group. The scores in the table below show th..
Normally distributed about a mean value of 580 with a standard deviation of 60. Determine what percentage of the students scored higher than 750 on the exam.
Suppose a random sample of size 36 is drawn from a population with a mean of 278. If 86% of the time the sample mean is less than 280, what is the population standard deviation?
The Skateworld Company operates ice rinks in several major cities throughout the United States. During each session of open skating, one customer is selected at random to receive a free pass for a future open skating session.
use smallest whole number. example if the ratio was 5520209 then the expexed ration would be 6221 use smallest whole
A supermarket chain is considering two sources A and B for the purchase of 50-pound bags of onions. The following table gives the results of a study.
Connect the successive points by line segments to help see the pattern. Are there systematic effects of time remaining after we regress consumption on price?
tom parks his car at a meter without paying for 1 hour. a parking enforcement officer checks for parking violations an
Suppose you roll a standard die 2000 times and let X be the sum of the values you get. Using the Central Limit Theorem, for what value of a is P[X >= a] approximately equal to P[N(0,1) >= 2] ?
Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is approximately normal. Find P90.
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
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