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The manufacturer of a certain type of ATM machine reports that the mean ATM withdrawal is $60. The manager of a convenience store with an ATM machine thinks that mean withdrawal from his machine is less than this amount. He obtains a simple random sample of 35 withdrawals over the past year and finds the sample mean to be $ 54. Assume that the population standard deviation is $ 13.
a) What is the sampling distribution of the sample mean? __________________
b) State the hypotheses- H0 and H1.
c) Compute a test statistic. _________________
d) Determine the corresponding p-value. __________________
e) Make a decision using the p-value approach at the given α = 0.05.
f) Compute a cutoff value (or critical value) ______________
g) Make a decision using the Decision Rule approach at given α = 0.05.
Perform a contingency analysis on the data to determine if there is any dependency between the number of level of education attained by the father and the size of his family.
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See if there is a difference in their means and variances.
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The upper limit of a 95% confidence interval for the population mean would equal:
Iit is known that signal change in this brain area is normally distributed with mean of 35 and standard deviation of 10. By using .01 level, what must researcher conclude?
What is the probability that a roulette ball will come to rest on an even number other than 0 and 00?
To test whether the population standard deviation differ significantly using Chi-Square test.
A sample of 10 urgent and non-urgent patients was conducted to determine average wait time. The hospital wants to be sure that urgent patients do not wait as long as non-urgent patients. The following hypotheses have been formulated.
Is the z value positive or negative? Explain why it should be positive or negative.
To test whether there is any association between two variables using Chi-Square test for independence.
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
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