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A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean?
Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes. a) What is the probability that the sample mean is between 7.8 and 8.2 minutes?
The annual demand for a product is 1,000 units. The company orders 200 units each time an order is placed. The lead-time is 6 days, and the company has determined that 20 unites should be held as a safety stock.
Which of the examples below represent the Ratio level of scaling?
Explain the difference between descriptive statistics and inferential statistics with less than 50 words? Name two graphs that can be used for describing qualitative data and two for describing quantitative data. Name one graph that can be used to ..
Can we conclude there is a difference in mean number of surgeries performed by hospital or by day of week?
Describe different methods of establishing correlation between variables and provide an example of each. Discuss the advantages and disadvantages of each method and where each must be applied.
P-value for test statistic is .085, determine the minimum level of significance needed to reject null hypothesis?
A doctor believes that the variance of systolic blood pressure is 470. A random sample of 20 patients found a variance of 525. What is the smaller critical value that would be used in a hypothesis test at a .05 significance level?
Risks and Odds in Everyday Life, James Burke claims that about 70 percent of all single men would welcome a woman taking the initiative in asking for a date. A random sample of 20 single men was asked if they would welcome a woman taking the initiati..
Calculate the expected number of days it takes to get the order and standard deviation.
Suppose that the number of calories in McDonald's Egg McMuffin is normally distributed random variable with mean of 290 calories and standard deviation of 14 calories.
A random variable X that has pmf given by p(x) = 1/ (n+1) over the range Rx = {0,1,2,...,n} is said to have a discrete uniform distribution. Find the mean and variance of this distribution.
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