00:01
For this problem we have a run of multiple choice questions.
00:07
The first question in the hypothesis testing, the probability of committing an error in rejecting a null hypothesis that is true is denoted by, it's denoted by the alpha signal, or symbol, excuse me.
00:21
What does the 0 .01 level of significance mean? so that would be, our level of significance is our alpha and it's telling us the probability of committing an error in rejecting a null hypothesis that is in fact correct.
00:38
So let's go ahead and say that, let's go with c.
00:44
For 12, what sample size will give a smaller standard error of the mean? well, we divide our standard deviation by our sample size, so the bigger the sample size, the smaller the standard error.
00:57
For 13, which of the following is described by the direction of the scatter plot? so the direction of the scatter plot is going to tell us about the trend between the two variables.
01:06
Is it a positive trend, a negative trend, or is there no trend? for 14, a vending machine is designed to fill plastic cups with 19 ounces of orange juice.
01:18
A consumer suspects the machine is not filling the plastic cups completely.
01:22
What type of test would we use for this? a t -test, a z -test, a two -tailed test, or a one -tailed test? i'm going to go, because this is cut off and i can't see the question, but i'm going to assume that we would want a one -tailed test, because if it's not filling the cups completely, we're trying to prove that it's less than 19, as opposed to that it's overfilling and underfilling, which would be different from 19.
01:55
When the null hypothesis is rejected, which of the following is true? if we reject the null hypothesis, then there is sufficient evidence to back up our decision...