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1. What is the importance of pretesting questions and instruments? What are risks of not doing this? Provide an example.
2.How do question content and wording, response strategy, and preliminary analysis planning affect question construction? Provide examples of questions that were positively and negatively influenced by these elements.
A manufacturing process produces items whose weights are basically distributed. It is known that 22.57% of all the items produced, weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams.
Twenty-five samples of size 4 resulted in statistics of x=30.0 minutes and R = 2.5 minutes for the company to completely clean a rug. Compute control limits for x- and R-charts and estimate the standard deviation of the process.
A large tank of fish from a hatchery is being delivered to a lake. The hatchery claims that the mean length of fish in the tank is 15 inches, and the standard deviation is 2 inches. A random sample of 36 fish is taken from the tank.
Suppose two-tailed test, state hypotheses (Ho and H1 ) for two-tailed test. Using symbols, define hypotheses (Ho and H1) for two-tailed test.
We suggest that you use the graphical approach to CVP analysis to solve the following problem, but you may use any other method to find the answer.
Using standard normal table, show critical value for left-tailed test with α = 0.02.
An old saying in golf is "you drive for show and you putt for dough." The point is that good putting is more important than long driving for shooting low scores and hence winning money.
Choose an article that explains research using one or more statistical tests (z, t, ANOVA, chi square, regression) as part of data analysis. Explain the study using the following information:
Basically trying to figure out once you get the test statistics how you determine critical value through the Table chart. Trying to find critical value for test statistics of 2.36 with 10 subjects, 7 had higher scores, 2 had lower scores, and 1 sco..
The amount of time ships spend at the Philadelphia dockyard follows an exponential distribution and the average time spent in the dockyard is 3.1 days.
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
What is the probability of finding a sheet chosen at random which contains 3 or more surface flaws and find the greatest standard deviation,
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