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In this case your bias is in favor of a "Cannot Reject the Null" which stands for "No statistical difference in the means" So run the following test and determine if the parts that are being manufactured are within specificationsQuestion: I used to manage a manufacturing plant making electrical switches. We molded 15 million polypropylene parts that went into the switches and one of the machines made a part that had a critical dimension ( a diameter on the shaft ) that we ran these tests to ensure they were made to spec. The population mean = 0.500" with a standard deviation of 0.003. Here is a random sample from one of the mold machines. The sample size is 30 and the average diameter is 0.4995" At the 0.01 alpha one tail test, determine if this lot is within spec or not
What is the probability that their average lifetime would be less than 510 hours? Use your calculator to solve this problem and give your answer as a number between 0 and 1, rounded to 3 decimal places.
Demonstrate your understanding of choosing the type of regression model to the given data, by explaning three factors that should be taken into account in the choice between different models.
A random group of apartments was selected from a city to analize the number of bedrooms they have. Is there evidence to reject the hypothesis that the apartments are equally distributed between 1 bedroom, 2 bedroom, and 3 bedroom apartments, at al..
Internet is 13.4 hours per week, with the sample standard deviation of 6.8 hours. Determine the 95 percent confidence interval for mean time Wired subscribers spend on Internet.
Operations manager thinks that only 10% of room service orders must take longer than 25 minutes if hotel has good customer service. Does hotel room service fulfil this goal?
One particular morning, the length of time spent in the examination room is recorded for each patient seen by each physician at an orthopedic clinic. Does the data prove a significant diference in mean times, using a=.05 Minutes in Examination roo..
Investigate the comparative pros and cons of the mean and the median. Find examples where the mean is more appropriate than the median and vice-versa. Discuss the locations of the mean, median and mode for a normal, left-skewed and right-skewed di..
Use a 0.01 significance level to test the claim that most people believe that the Loch Ness monster exists. How is the conclusion affected by the fact that Internet users who saw the question could decide whether to respond.
State the formula for the test statistic and show your decision rule using the 1 percent level of significance. (c) Carry out the test. Show your work. (d) What assumptions are required?
The next 6 are assigned to treatment B. The last 6 are assigned to treatment C. Do you see any problem with this strategy of assigning treatments to experimental units?
Tthe job is normally distributed and has a mean time of 30 minutes with a standard deviation of 8 minutes. How much time should the employer allow employees to finish the job?
Suppose the college in question 12 has only graduated 10,000 students. Construct a 96 percent confidence interval for the mean time required for all graduates to earn a bachelor's degree.
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