week 12 carmen quiz: hypothesis tests for a population mean
A Type 2 error is described as a false alarm.
false
Suppose someone reports that the average age of all Pokemon players is 13. You believe it's higher than that because your statistics professor plays Pokemon. You decide to challenge the claim. Do you use a confidence interval or a hypothesis test?
hypothesis test
If you reject Ho, which type of error could you be making?
type 1 error
Bottles of cream have a normal distribution with mean 8 ounces. You would stop the process if the containers were being filled incorrectly. Your sample of 30 containers has an average weight of 7.7 ounces. Assume the standard deviation is .8. What is your test statistic?
-2.05
What is the name for the cutoff value that lets you decide between rejecting Ho and failing to reject Ho with your p-value?
significance level
When you take the given information and form a Z-score in a hypothesis test for the mean, what is the special name of that result?
test statistic
If Ha is not equals, you have to double the probability of being beyond your test statistic to get your p-value.
true
If you reject Ho in a hypothesis test for the mean, the value of uo is guaranteed not to be in the corresponding confidence interval. (Assume Ha is , alpha = .05, confidence level = 95%)
true
Bob's alternative hypothesis is Ha: u > 8 and his test statistic is 1.75. What is Bob's p-value?
.0401
Suppose you want to estimate the average age of all Pokemon players. Would you use a confidence interval or a hypothesis test?
A confidence interval
If your p-value is .11, and the significance level is .05, what do you conclude?
fail to reject ho
If your test statistic is negative, so is your p-value.
false
Your friend claims the average price of a burger in the Columbus Gateway Area is $10.00. You believe it's lower than that. What symbol represents the $10 in this scenario?
mew 0
The p-value will change if you get a new data set.
true
In testing the hypotheses Ho: µ = 800 vs Ha: µ≠800, if the value of the test statistic equals 1.75, then the p-value is:
0.0802
Bottles of cream have a normal distribution with mean 8 ounces. You would stop the process if the containers were being filled incorrectly. What is your alternative hypothesis?
Ha: u not equal to 8
Failing to reject Ho and Accepting Ho are both appropriate conclusions that mean the same thing.
false
The significance level is the same as a Type 2 error.
false
The value of α will change if you get a new data set.
false
Suppose someone claims the average delivery time for U.S. packages to be delivered during December is 2 days. You believe it takes longer than that. You conduct a hypothesis test; what are your hypotheses?
Ho: µ = 2 vs. Ha: µ >2
