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Last year, your company's service technicians took an average of 2.6 hours to respond to trouble calls from business customers who had purchased service contracts. Your company wants to find out if this year's data show a different average response time. In order to do so, they review 42 service calls and construct a 95% confidence interval for population mean: (2.468, 2.743).
What can we conclude about the significance test of Ho: mu = 2.6 vs Ha: mu does not equal 2.6?
If each professor has an equal chance of being selected, what is the probability that both professors are chemistry professors?
Chandra has 5 liters of a 24% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 8 liters of 27% solution?
Probability of selecting a household with no children that is equal to the value obtained by the census. Give the z statistic (rounded to two decimal places) and the P-value. What do you conclude?
The mean weight for a certain type of fish is known to be 28.0 ounces with a standard deviation of 2.5 ounces . A game warden catches and weighs 30 fish from a certqin pond to check if they are larger than the mean stated above.
Obtain a test statistic and p-value. Interpret the results at = .01.
Which of the following statements is true regarding the leverage of supply chain savings? Supply chain leverage is about the same for all industries.
There is a worker error is 0.3, and the probability that an accident will occur when there is no worker error is 0.2. Find the probability of a worker error if there was an accident.
Let random variable X represent number of heads on first toss and y total number of heads from three tosses. Sketch tree view with X as first level and Y/X as second level and determine conditional probability p(Y=2/X=1).
Is this statistically significant evidence that candidate has sufficient valid signatures overall? Describe.
Write a one-page report to Ms. Gupta presenting your conclusions regarding the market performance of Brand 1.
We can think of this as the value of mew that maximizes f(y), the probability that our observed value of y occurs.
Assume you want to estimate the population proportion,p, and the estimator for the mean proportion (p-hat)= 0.34, N = 6000, and n = 1300. Find an approximate 95% confidence interval for p.
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