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A manufacturing company wants to investigate the product coming out of two machines has a similar diameter or not. It is established that the standard deviation of the diameter for the parts from Machine A is 0.025 units, and that for Machine B is 0.034 units. The question is whether Machine B has a larger average diameter than Machine A. Test this hypothesis using the Z-test. The population parameter of interest is µA - µB (the difference in the two population means). A random sample of 100 parts is selected from each machine and the mean for Machine A was 0.501 units for machine A and 0.509 units for Machine B.
a. State Null hypothesis
b. State Alternate hypothesis
c. What is the calculated value of Z at ? = 0.05?
d. Determine the Z-critical
e. Draw a conclusion
the mean number of animals in a forest of a certain variety is 40 and the standard deviation is 4. a random sample of
Let z be a standard normal random variable and calculate the following probabilities:
Roper ASW conducted a survey to learn about American adults' attitudes toward money and happiness. 56% of respondents said they balance their checkbook at least once a month.
Determine the variance of firm's profit for the month.
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Do you think that all random samples taken from the same population will lead to the same result?
1.i use computer software to do the following. i generate ten random numbers from a n500 100 distribution. from these
Mean output of solar cells of three types are measured six times under random light intensity over a period of 5 minutes, yielding the results shown. Research question: Is the mean solar cell output the same for all cell types?
Using the .05 level of significance: a) Is there a difference among types of gasoline? b) Is there a difference in the cars?
question 1 a long-term record for weather in a certain province shows that the annual precipitation has a mean of 39.67
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