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Q1) Each month National Association of Purchasing Managers publishes NAPM index. One of the questions asked on survey to buy agents is: Do you believe economy is expanding? Last month, of 300 responses, 160 answered yes to question. This month, 170 of the 290 responses indicated they felt economy was expanding. At 0.05 significance level, can we conclude that larger proportion of agents think the economy is expanding this month?
In year 2007 the mean fare to fly from Chariotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. Random sample of round-trip discount fares on this route last month gives:
$321
$286
$290
$330
$310
$250
$270
$280
$299
$265
$291
$275
$281
At 0.01 significance level can we conclude that mean fare has increased? Determine the p-value?
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
In past, mean processing time was 45 days. At 0.05 level of significance, is there evidence that mean processing time has changed from 45 days?
Using standard normal table, show critical value for left-tailed test with α = 0.02.
Draw the suitable 2x2 table, compute and interpret suitable measure of association.
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
You are considering adding a new food product to your store for resale. Explain how many units of the new product should be purchased for resale.
Real estate agents always say "location, location, location" is the most important thing in buying a house. We want to know if the sales prices of homes in two neighborhoods are similar. A random sample is taken from each neighborhood. The prices ..
Bill Russ, the production manager at Ross Co., maintains detailed records on number of times each machine breaks down and requires service all through the week. Bill records show that the Puret grinder has required repair service according to the ..
A certain random experiment can result in one of four different possible outcomes, which we'll call A, B, C and D.
Construct appropriate control charts for before and after introduction of the new pathway. Discuss process stability and the results.
Recognize and describe potential threats (up to 3) to internal validity.
Linear programming problems. Computethe following linear programming problem. Among which of the following points (X,Y) is feasible.
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