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2. In the Snohomish country, Family income ~ N($25000, $1000^2 ). If the low-income level is $15,000, what percentage of the population lives under the low-income level? (hint: Normal distribution)
3. The Darigold uses a filling machine to fill milk bottles with 2% milk. The milk bottles should contain 350 ml of milk. But the container will vary with a mean of 348 ml and a standard deviation of 3 ml.
a) What is the probability that a bottle contains less than 3 ml of the original size?
b) What is the probability that the mean of the six-pack bottles is less than 345 ml?
The time a cashier spends processing individual customer's order are independent random variables with mean 2.5 minute and standard deviation of 2.
looking at research conducted comparing salaries of state employees from city employees.a. should a t - test be used
(a) Draw a boxplot of these data. Do you think a normality assumption is reasonable? (b) Calculate a 95% confidence interval for the mean payback period for this sort of retro-fitted double glazing. (c) How large a sample would be needed to estimate ..
Gravelle Meats is in the business of selling turkeys. The mean time it takes for an employee to a turkey for sale is 4 hours
Explain the difference between a left tail, two-tailed, and right tailed text. When would we choose a two tailed test? How can we tell the direction by looking at a pair of hypothesis?
If three systems are installed, what is the probability that at least one of the systems will detect the attack? Would you recommend that multiple detection systems be used? Explain.
1. In all the following questions {Zt} is a purely random process with mean E[Zt ] = 0, variance Var(Zt) = σ 2 , and successive values of Zt are independent so that Cov(Zt , Zt+k) = 0, k 6= 0.
A new surgical procedure is said to be successful 80% of the time. Suppose the procedure is performed five times and the results are assumed to be independent of one another. What is the probability that a. all procedures are successful? b. exact..
Test, at the 5 percent level, the hypothesis that an earthquake is equally likely to occur on any of the 7 days of the week.
How are prokaryotes and eukaryotes different in terms of the RNA polymerases involved in transcription?
computing the mean standard deviation values for the given data.1. choose the most appropriate and precise type of
Is the hypothesized difference (0.00) within the interval? Given the presence or absence of the 0.00 value within the interval, is this consistent with the findings of the hypothesis test?
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