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In an article it was claimed that the average supermarket trip takes 22 minutes. Suppose that, in an effort to test this claim, a sample of 50 shoppers at a local supermarket were studied.
A manufacturer of flashlight batteries took a sample of 13 batteries from a day's production and used them continuously until they failed to work. The life as measured by the number of hours until f
A large university wants to estimate what proportion of their full time math students are male. If a random sample of 100 math students are taken and 30 of the students are male, what would the conf
Compute the probability that the sample variance from the second sample exceeds the one from the first. Hint: Relate it to the chi-squre distribution and then the F-distribution.
Find the test statistic and critical value. What would the Ho and Ha be? Would you reject or fail to reject the null hypothesis?
A bleary-eyed student awakens on the morning, late for an 8:00 class, and pulls two socks out of the drawer which contains two black, six brown, and two blue socks, all randomly arranged. Determine
The number of crimes before as well as after the watch is indicated in the table that follows. Has there been the decrease in the number of crimes since the program was inaugurated? Employ the 0.05
(a) State the hypotheses for a right-tailed test. (b) Obtain a test statistic and p-value assuming unequal variances. Interpret these results using a = .01. (c) Why might the sample data not follow
(c) Find out the test statistic and its p-value. Determine your conclusion at ? = .05? (d) If statistically significant, can you suggest factors that might explain the increase?
The firm desires to establish 90% confidence interval for this magazine's write-off proportion that is accurate to 0.02 (margin of error=.02)
Determine the test statistic and critical value. What would the Ho and Ha be? Do you support the counselors claim?
In the survey, 160 consumers were asked regarding their buying preferences concerning the product that is sold in market under three labels. The results were as follows.
Under what circumstances should a nonparametric test be employed? Discuss. Determine the strengths and weakness of nonparametric tests? Can the outcomes of the nonparametric tests be generailized.
Can the formal hypothesis testing approach be used for non parametric tests? how are parametric and nonparametric statistics different?how are parametric and nonparametric statistics similar?
Compute the coefficient of determination. Interpret the meaning of the coefficient of determination.
Find the mean, variance, and standard deviation. Please show all of your work.
The correlation coefficient between high school GPA and college GPA is 0.560. For a student with a high school GPA that is 2.5 standard deviations above the mean, we would expect that student to hav
The health of bear population in Yellowstone National Park is monitored through periodic measurements taken from anesthetized bears. A sample of 54 bears has the mean weight of 182.9 lb.
Let U be the uniform (0,1) random variable. Assume that n trials are to be performed and that conditional on U-u these trials will be independent with the common success probability u. Calculate the
A researcher claims that 62% of voters favour gun control. Assume that a hypothesis test of the given claim will be conducted. Identify the type II error for the test. The error of rejecting the cla
A U.S. Travel Data Center's survey of 1500 adults found that 42% of respondents stated that they favor historical sites as vacations. Find the 95% confidence interval of the true proportion of all a
A researcher is interested in estimating the average salary of teachers in a large urban school district. She wants to be 95% confident that her estimate is correct.
Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis when for a two-tailed test.
The following confidence interval is obtained for a population proportion, p: (0.298, 0.338). Use these confidence interval limits to find the point estimate P^.