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Suppose a population proportion is .40, and 80% of the time when you draw a random sample from this population you get the sample proportion of .35 or more. How large a sample were you taking?
Please provide answer via excel.
Is there a significant difference the four testing conditions?
The manufacturer of a coffee dispensing machine claims the ounces per cup is normally distributed with population mean equal to 8 ounces and standard deviation equal to 0.9 ounces. If 50 cups of coffee were measured, what is the possibility that- ..
The Duracells had an average lifetime of 18.67 hours (SD = 1.176 hours) while the Energizer batteries had an average lifetime of 16.83 hours (SD = 2.878 hours). Assuming the population standard deviations to be equal, what is the test statisitic a..
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
An instructor claims the average time to take a statistics test is greater than 39 min. As, if a sample of 33 students took 43 min. is the instructor's claim true?
Interpreting confidence interval for the P-value. Give an appropriated response. A weight loss center provided a loss for 72% of its participants.
The casino game craps is based on rolling two dice. Here is the assignment of probabilities to the sum of numbers on the up face when two dice are rolled:
If you use a 0.10 level of significance in a two-tail hypothesis test, what is your decision rule for rejecting a null hypothesis that the population mean is 500 if you use the Z test?
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
Use the mean, median, and mode to make a statement about the difference in performance for city and highway driving.
Assume that Leo advertises "If it takes more than 30 minutes to get your pizza, you get it free". What percentage of his take-out pizzas will have to give away free?
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