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A sample of 270 batteries for a hand-held computer has a sample mean life of 56.0 hours and a sample standard deviation = 5.60 hours, find the upper limit of a 98% confidence interval estimate of t
A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 99% confident that her estimate is correct. If the standard deviation is 4.09, how larg
Refer to the following information and output. What is the probability that the service facility will be idle?
it is known that x is normally distributed with mean 12.1 minutes and standard deviation 3.8 minutes, under ordinary traffic conditions. what is the probability that a single car chosen at random wi
Casino Windsor conducts survey to determine the opinion of its customers. Among other questions, respondents are asked to give their opinion about "Your overall impression of Casino Windsor". The re
The waiting times have a standard deviation of 4.9 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
The normal distribution with mean 300 hours and standard deviation 10 hours. Compute the probability that at least one of the three chips last at least 290 hours.
The ages of 25 employees in a company are listed below in a stem and leaf plot. What is the probability that a worker chosen at random will have an age greater than or equal to 30 and less than or e
find the probability that the average diameter of those sand dollars is more than 4.13 centimeters. Assume that the variable is normally distributed.
What is the probability that the moisture content of a wheel (i)exceeds 10 kilograms? (ii) is less than 8.5 kilograms? (iii) Differs from the mean by more than .45 kilograms?
in a random sample of 184 college students, 97 had part time jobs.find the margin of error for the 95 % confidence interval used to estimate the population proportion .
The same students increased their scores on a retest to: 85,79,75,95, and 84. At the 0.05 significance level, is the intervention plan helpful in increasing grades?
Two hundred seeds of such a cross are raised, and 142 turn out to be blue-flowering. Are the data consistent with the model? Answer yes or no and explain briefly.
what are the assumptions and lilitations of the alalysis of variance in comparison with the t-test include a discussion of post hoc test. What are the assumptions for using a chi-square test.
Construct a 98% confidence interval for the average life expectancy of countries around the world. The data appear to be normally distributed.
A survey of 200 recent graduates from your school revealed that 80 students had jobs. At the .02 significance level, can we conclude that a larger proportion of students at your school have jobs?
The standard deviation of the scores is probably close to the value 0.78 for the adult male population. How large an SRS of hotel managers do you need?
What true percent of the data lies within one standard deviations of the mean? Within two standard deviations of the mean? How do these results agree with the Empirical Rule?
What is the standard deviation of the distribution of differences between means? b.) What is the mean? c.) What will be its shape?
A coin is tossed 25 times. let x + the number of tosses that result in heads(H) Consider the following rule for deciding whether or not the coin is fair
A person enters a bank and finds all of the n clerks busy serving customers and k customers awaiting service. The bank employs a first come, first serve policy. Customers are independent, identical,
Given the linear regression equation created by your co-worker, what would be the best estimate for the value of y, in the case where x = 140?
a company prodruces packets of soap powder labeled "Giant size 32 ounces." The actual weight of soap powder in a box has normal distribution with a mean of 33 ounces and a standard deviation of 0.7
If its weekly cost function is C(x)=68,000+150x, how should the manufacturer set the size of the rebate in order to maximize its profit?
What is the probability of selecting someone at random from this population who has a cholesterol value less than 180?