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Sales delay is the elapsed time between the manufacture of a product and its sale. According to the article "Warranty Claims Data Analysis Considering Sales Delay" (Quality and Reliability Engr. Intl., 2013: 113-123), it is quite common for investigators to model sales delay using a lognormal distribution. For a particular product, the cited article proposes this distribution with parameter values µ = 2.05 and s2 = .06 (here the unit for delay is months).
a. What are the variance and standard deviation of delay time?What is the probability that delay time exceeds 12 months?c. What is the probability that delay time is within one standard deviation of its mean value?d. What is the median of the delay time distribution?e. What is the 99th percentile of the delay time distribution?f. Among 10 randomly selected such items, how many would you expect to have a delay time exceeding 8 months?
The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude toward school, and study habits of students. Scores range from 0 to 200.
Use simple exponential smoothing with α = 0.33 to forecast battery sales for February through May. Assume that the forecast for January was for 22 set of tires.
1) Find the area under the standard normal curve that lies between z = -2.4 and z= 1
Interpret the meaning of the slopes of the given multiple regression equation
Mercedes Goes After Younger Buyers
The average hourly wage of workers in a fast food restaurant is $5.85 with a standard deviation of $0.35. Assume that the distribution is normal.
assume a normal distribution. draw a well-labeled curve for each part. round both to two decimal places.a. find
the probability of pass a test is 0.76 at a particular school. suppose we randomly select a class of 10 students from
Let X have normal density with mean 1 and variance 9. Find the inflection points of its density.
Calculate summary statistics for each formulation. Graph the data. Summarize your findings.
A sample of n=20 has a mean of M=40. If the standard deviation is s=5, would a score of x=55 be considered an extreme value?
quantitative research questiondownload gpower and play around with it. see how changes in assumptions and parameters
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