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At a large department store, the average number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years, and the distribution is approximately normal. If an employee is pi
A study of cats and dogs found that 39 of 60 cats and 21 of 50 dogs slept more than 10 hours per day. At the 0.05 level of significance, is there sufficient evidence to Conclude that a difference ex
A current survey reported that in sample of 300 students who attend two-year colleges, 105 work at least 20 hours per week. Additionally, in a sample of 225 students attending private four-year univ
Bob Nale is the owner of Nale's Quick Fill. Bob would like to estimate the mean number of gallons of gasoline sold to his customers. Assume the number of gallons sold follows the normal distribution
As part of an annual review of its accounts, a discount brokerage chooses random sample of 36 customers. Their accounts are reviewed for total account valuation, which showed a mean of $32,000, with
Based upon this sample information, construct a 98 percent confidence interval for population mean yearly premium. (Round up your answers to the next whole number. Omit the "tiny_mce_markerquot; sig
Make a 99 percent confidence interval for the proportion of applicants that fail the test. (Round your answers to 2 decimal places.)
Compute the standard error of the estimate for the data below.
The following data list ages of cars (in years) and monthly repair cost in dollars. What is the standard error of the estimate?
68% of students at a university live on campus. A random sample found that 24 of 40 male students and 43 of 55 of female students live on campus. At 0.05 level of significance, is there sufficient e
Write down the null and alternative hypotheses, the observed test statistic, the p-value and state your conclusion in the context of the question. Check the conditions required for applying the test
A colony of laboratory rats contains 7 albino rats and 23 hooded rats. What is the probability of randomly selecting an albino rat from this colony?
In a group lineup of 7 models in a commercial, 3 are male and 4 are female. In how many manners can you arrange three models in lineup if the first and the third should be a male but the second one
Using the 99 percent confidence interval, can the bank manager be 99 percent confident that u is less than six minutes? Discuss. Based upon your answers to parts b and c, how convinced are you that ne
Based on the probability you computed in part a, would you conclude that more than 30 percent of Americans (18 years or older) say that figure skating is their favorite Winter Olympic event?
Let X and Y have the joint density function f (x, y) = k(x ? y), for 0 ? y ? x ? 1, and 0 elsewhere. Draw the region over which the density is positive and employ it in determining limits of integrat
Given sample size of 34, with sample mean 660.3 as well as sample standard deviation 104.9, we perform the following hypothesis test. Null Hypothesis 0:700H?=
A statistician is looking at the relationship between the explanatory variable of dosage of medication andthe response which is time to relief of pain. She believes there is a a linear association.
Provide your value of test statistic you obtained. What is your decision if the level of significance is ? = 0.1? Explain in <100 words how you came to this decision.
Let Ho: Age and Observance of traditions are independent. Let Ha be: Age and Observance of traditions aren't independent. A type 1 error in this context would be. Saying age and observance are indep
The null hypothesis for the chi squared test of independence will be rejected at alpha = .05 and a contingency table with 4 rows and 6 columns if.
The Central Limit Theorem is important in the study of statistics because It tells us populations are almost always normally distributed.
Determine the probability that the time between two consecutive purchases at this website would be greater than 2 minutes? Show your work and round your answer to 3 decimal places. Describe the mea
Examine and discuss how many independent variables there're in 2 x 3 experimental design and how many independent variables there are in 2 x 3 x 2 experimental design. Explain an experiment you woul
Salt-free diets are often prescribed to the people with high blood pressure. The following data values were obtained from experiment designed to determine the reduction in diastolic blood pressure a