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Question: Toys are entering the virtual world, and Mattel recently developed a digital version of its famous Barbie. The average price of the virtual doll is reported to be $60.16 A competing product sells for an average of $65. Suppose both averages are sample estimates based on independent random samples of 25 outlets selling Barbie software and 20 outlets selling the competing virtual doll, and suppose the sample standard deviation for Barbie is $14 and for the competing doll it is $8. Test for equality of average price using the 0.05 level of significance.
As part of your answer, draw a standard normal curve and shade the area under the curve that represented the answer to the question. What minimum score would a student need in order to score better than 77% of those taking the test?
An average computer mouse inspector can inspect 50 mice per hour. The 48 computer mice inspectors at a particular factory can only insppect 46 mice per hour with a standard deviation of 10.
Pets. The American Veterinary Association claims that the annual cost of medical care for dogs averages $100, with a standard deviation of $30.
A financial planner wants to compare the yield of income- and growth-oriented mutual funds. Fifty thousand dollars is invested in each of a sample of 35 income-oriented and 40 growth-oriented funds.
An ordinary (fair) die is a cube with the numbers1through6on the sides (represented by painted spots). Imagine that such a die is rolled twice in succession.
A discussion of extreme weather reports that: "In most states, hurricanes occur infrequently. Yet, when a hurricane hits, the losses can be catastrophic.
a teacher gives a third grade class of n 16 a reading skills test at the beginning of the school year. to evaluate the
the liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its
Bags of cookies that have weights in the upper 7.5% are too heavy and must be repackaged. What is the most a bag of cookies can weigh and not need repackaging?
the number of calories and number of grams of sugar per serving were measured for 36 breakfast cereals. the data are in
"Broad constructionalists" believe that modern sensibilities need to be brought into any analysis of the document and what it means and that the spirit, rather than the letter, of the document should be used in determining national laws and regulatio..
in a random sample of 400 residents of chattanooga 320 residents indicated that they voted for the democratic candidate
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