Consider the following interval: (.345, .678).
What was the point estimate and sampling error used to construct this interval?
What is .5115 and .1665?
100
What good would increasing our sample size do?
What is provide a better, more accurate estimate?
100
The president claims that more than 70% of Americans give their approval to his term. In a random sample of 500 Americans, 320 of them approve the president's terms and actions. Is there sufficient evidence to support the president's claim?
What are the null and alternative hypotheses?
What is H sub 0: p = .70, H sub a: p > .70?
100
p-value = significance level?
What is false?
(Observed significance level.)
100
If X = 23 and n = 48, q hat = ?
What is .521?
200
If I am interested in a 88% confidence interval what will be the subscript on my z or t? (They are the same.)
What is .06?
200
Estimate the ratio of people who watch 3 or more hours of TV a day. To be within .05 of the true parameter with probability .9, how many people should we survey?
What is the parameter we are determining sample size for? What is the formula?
What is p and n = (z of alpha/2)^2 x (pq) / SE^2?
200
The rejection region is on what side of the 0 if you H sub a is the following:
H sub 0: mu > 12
How much area belongs to the rejection region is alpha/2 = .025?
What is right and .05?
200
If the p-value is equal to the alpha, you reject H sub a. True or false?
What is true?
200
DOUBLE JEOPARDY:
When is our final exam review for the Study Union event?
Date and time.
What is Sunday, December 4th at 2PM?
300
If I have a sample of size 30, is this a large or small sample? Based on your answer, what table will we use?
What is large, z-table?
300
Estimate the average salary of mailmen. We would like our estimate to be within $3000 with probability .97. How many mailmen (mailwomen) should we sample in our experiment?
What is our target parameter? What is the formula?
What is mu and n = (z of alpha/2)^2 x (sigma)^2 / SE^2?
300
If the test statistic is in the rejection region we are not rejecting H sub a, true of false?
What is true?
300
Consider the following: P(z < -3.03) and mu sub 0 = 17.
What was our H sub a and test statistic?
What is H sub a: mu < 17 and 3.03?
300
What z score do you get if you look up the following area:
.3780
What is 1.165?
400
Given, [t of .04, 9], what was my original sample size and level of confidence? If I decreased this confidence would I create a smaller or larger "interval?"
What is 10, 92, and smaller?
400
Revisiting our previous example:
Estimate the average salary of mailmen. We would like our estimate to be within $3000 with probability .97. We know that the range of salaries range from a low of $15,000 to a high of $35,000. How many mailmen (mailwomen) should we sample in our experiment?
What is 14?
400
A car manufacturer claims their new economy model gets an average mpg of at least 58. A random sample of 46 of these cars yields a mean of 56 with a standard deviation of 6. Is this evidence to show the claim is too high?
In these terms (using words) what would be classified as a Type I error?
What is "If we say the true average mpg of their new economy model is less than 58 when in reality it is equal to 58 (or, technically, greater than or equal to 58.)"?
400
H sub 0: mu = 880 and H sub a: mu != 880; TS = -2.03;
What is the p-value?
If alpha = .05 what conclusion can you draw?
What is .0424 and reject H sub 0?
400
What do you get if you look up the following:
t sub .025, 6
What is 2.447?
500
Estimate the proportion of Orlando residents who support the new mayoral candidate for this upcoming election. From a random sample of 38, 23 support the candidate. Find a 96% confidence interval. Interpret your result.
What is (.45, .77) and we are 96% confident that the true proportion supporting the new mayoral confident is within .45 and .77.
500
Revisiting our previous example:
Estimate the ratio of people who watch 3 or more hours of TV a day. To be within .05 of the true parameter with probability .9, how many people should we survey?
n = ?
What is 271?
(Remember we have no idea what p is so we use .5. Be prepared for the case if you do have an idea what p is.)
500
In a large sample test of H sub 0: u = 2 versus H sub a: u != 2, what is the rejection region if we want the significance level to be .06?
Should be in the form:
X (sign) Y
What is z < -1.88 and z > 1.88?
(Note z for large and both tails.)
500
In a test of hypotheses, if the p-value is .4 and we are using alpha = .06, then the appropriate conclusion in handling H sub a would be?
What is to reject H sub a (i.e. do not reject H sub 0)?
500
Consider: alpha = .04 and the interval (.123, .234).
What is the degree of freedom using the approximation for sigma?