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Marketing companies widely use surveys in order to monitor the opinions of the consumers. Last year, a survey was undertaken to ask consumer about who buys different warranties for electronic appliances. Of a sample of 1,000, 50% indicated that they would buy the warranty. This year, another survey of 900 consumers revealed that 40% will buy the warranty.
a) Test whether there is sufficient evidence to conclude that the popularity of warranties for electronic appliances has decreased. Use a 5% significance level and the critical value approach.
For this question, we should use H0: P1-P2 =0 OR H0: P1-P2 =0 and what is different ?
Assume the random variable x is normally distributed with mean mu = 85 and standard deviation sigma =4. Find the indicated probability. P(x
Study on the enhancing effects of coffee on long-term memory found that 35 participants given 200 mg of caffeine performed better on a memory
Assume the amounts are approximately normally distributed. What are the critical values you should use to test the given hypothesis?
q1 both undergraduates and postgraduates can use the university cafeteria. each diner can choose between buying a meal
A doctor knows from experience that 20% of the patients to whom he gives a high blood pressure drug will have undesirable side effects. Assume the doctor gives that drug to ten of his patients
the interquartile range is used as a measure of variability to overcome what difficulty of the range?a. the range is
Find the indicated area under the standard normal curve. Between z=-0.15 and z= 0.15
questiona discuss what is meant by quality control and quality improvement. b what are the limitations of a quality
Confidence intervals, again. Several factors are involved in the creation of a confidence interval. Among them are the sample size, the level of confidence, and the margin of error. Which statements are true?
Find the mean, variance, and standard deviation and interpret. Construct a frequency table with ?ve classes.
Languages in Canada Canada has two official languages, English and French. Choose a Canadian at random and ask, "What is your mother tongue?"
Consider a reaction in which three neutrons are emitted initially. Let c denote that a given neutron is captured by another nucleus; let n denote
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