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Problem 1: Statistics students believe that the mean score on the first statistics test is 65. A statistics instructor thinks the mean score is higher than 65. He samples ten statistics students and obtains the scores 65; 65; 70; 67; 66; 63; 63; 68; 72; 71. He performs a hypothesis test using a 5% level of significance. The data are from a normal distribution.
Problem 2: Joon believes that 50% of first-time brides in the United States are younger than their grooms. She performs a hypothesis test to determine if the percentage is the same or different from 50%. Joon samples 100 first-time brides and 53 reply that they are younger than their grooms. For the hypothesis test, she uses a 1% level of significance.
Problem 3: Suppose a consumer group suspects that the proportion of households that have three cell phones is 30%. A cell phone company has reason to believe that the proportion is 30%. Before they start a big advertising campaign, they conduct a hypothesis test. Their marketing people survey 150 households with the result that 43 of the households have three cell phones.
Does knowing high school seniors' IQ scores indicate anything about their high school graduation grade point averages and Is there a relationship between a person's sociability and cheerfulness
Please see the attached file for the fully formatted problems. Convert the following equations into logarithmic form:
Probability using Z-score.Find the probabilities that a random variable Z having a standard normal distribution will take on a value.
We conclude that memory of food intake in the distant past is fair to poor." Explain to your audience why r=0.217 points to this conclusion.
At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?
a study is to be conducted on the proportion of u.s. citizens who believe the minimum wage should be raised. what is
a number of tubes of toothpaste purchased by a typical family is a random variable having a poisson distribution with
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
a simple random sample of 300 properties is taken from a collection of 9500 properties 3000 of which do not have
Find out the probbility that exactly five arrive within two days?
a 95 confidence interval for a population mean was reported to be 152 to 160. if s 15 what sample size was used in this
Comparing the experimental and theoretical probabilities, can you say the die used in this experiment is a fair die? Why or why not?
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