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To determine the effect their salespeople have on purchases, a department store polled 700 shoppers regarding whether or not they made a purchase and whether or not they were pleased with the service they received. Of those who made a purchase, 151 were happy with the service and 143 were not. Of those who made no purchase, 221 were happy with the service and 185 were not. Use probability rules (when appropriate) to find the probability of the event stated. (Enter your answers as fractions.)
(a) A shopper was happy with the service received.
(b) A shopper was unhappy with the service received.
Some school busses manufactured on the moon are not plasma-powered vehicles. Therefore, it is false that all school busses manufactured on the moon.
What is the Standard deviation of X? What is the Standard Error of X? Calculate the 95% confidence interval for X. Calculate the 99% confidence interval for X.
ELISA reported the presence of HIV antibody. What is the probability that the selected person actually carries the HIV antibody?
Over the next week, 5 new students develop the flu. What is the prevalence of flu at the end of the week?
a certain zoo is know to collect unusual animals from different animal groups. one ostrich specimen in the zoo weighs
To check the average cost to repair a bridge, a random sample of n=55 bridges was chosen. The mean and standard deviation for the sample
Speci?cally, we recall that to improve its safety record, the company began tracking the time in between recordable safety incidents. During the ?rst year of the pro- gram, the waiting time (in days) until the occurrence of a recordable safety in..
What is the approximate value of the median? The first and third quartiles?- What do the asterisks (*) at the right of the display indicate? What implications might they have for the production supervisor?
100-meter run again refer to exercise 4.14 in which a 100-meter sprint is run by john bill ed and dave. assume that all
From a decision-analysis perspective, why is it worthwhile to spend time studying the Utility Axioms and Paradoxes?
Golfers arrive at the starter s booth of a public golf course at a rate of 8 per hour during the Monday-to-Friday midweek period.
Surveys 32 currents students discovering that 12 will return for summer school. b. with a 0.95 probability, how large of a sample would have to be taken to provide a margin of error of 3% or less?
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