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Time spent on the use of e-mail per session is normally distributed with a population mean of 8 min and a population standard deviation of 2 minutes. For a sample of size 100, what percentage of the sample means will lie between 7.8 and 8.2 minutes?
Outside a home, there is a 4 keypad with letters, A, B, C, D that can be used to open the garage if the correct four-letter code is entered. Each key may be used only once. How many codes are possible?
What type of inference is being made? Will the decision not to lower prices be a good one - Comment on the executive's conclusion.
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
rolling a fair eight sided dice produces a uniformly distributed set of numbers between 1and 8 with a mean of 4.5 and a
an irate student complained that the cost of textbooks was too high. he randomly surveyed 36 other students and found
Another mistaken poll. Prior to the mayoral election discussed in Exercise, the newspaper also conducted a poll.
Suppose the probability that Dave's house is destroyed by fire that year is 0.003. What is the expected net value of the insurance policy to Dave?
Using language that can be understood by someone who knows no statistics, write a paragraph explaining what a P-value of less than 0.01 means in the context.
Top-grade offering a new shipping option. When an order is placed, top-grade will ship one third of the order every week for three weeks instead of at one time. What is the order quantity if Omar chooses to use this option? To simplify your calcul..
suppose that in a certain texas town 70 of the voters are republicans 20 of the voters are democrats and 10 of the
Give an example from everyday life where you could use the Normal distribution to determine the probability of something. What is a z score and how could calculating a z help you in a business situation?
Describe in some detail how a hypothesis test could be used in some real world context such as business, politics, church, Girl Scouts, school, or perhaps your place of work.
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