Show:
What's My Hypothesis?
Where's My Tail?
Standard Error of the Mean
P-Values
Hodgepodge Free-for-All Crazy Stuff
100

A statement which shows your initial claim.

Null Hypothesis

100

What is used to determine the tail you evaluate?

Sign of the alternative hypothesis.

100

What is the formula for standard error of the mean?

What is sigma divided by the square root of n?

100

How do I calculate a P-value using GDC?

normalcdf(lower bound, upper bound, mean, standard deviation)

100
The mean of the means is the mean of the what?
What is population?
200

A statement which shows the claim you want to test.

Alternative Hypothesis

200

My alternative hypothesis reads μ < 5.6.

Which tail will I look at to calculate the probability?

Left Tail

200
When sigma is 100 and standard error is 20, what must n be?
What is n = 25?
200
What would you plug into the calculator if you wanted the probability above a Z-Score of 2.2?
What is normalcdf(2.2, 1E99, 0, 1)?
200
What is the formula for a confidence interval?
What is x-bar minus CV(sigma/sqrt(n)) less than or equal to Mu less than or equal to x-bar plus CV(sigma/sqrt(n))?
300

Null and alternative hypotheses always involve values of this parameter.

μ (Population Mean)

300

My alternative hypothesis reads μ ≠ 8.

Which tail will I look at to calculate the probability?

Both Tails

300
If sigma is 36 and n is 100, what is standard error?
What is 3.6?
300
When your p-value is larger than the level of confidence, what do you do with your null hypothesis?
What is fail to reject?
300
What is the name of the college in IRELAND that Ms. Gillespie attended?
What is Trinity College?
400

A recent study revealed that the average high school student spends about 200 minutes per day on Instagram. SLCS assumes students use less than this. Conduct a test of hypotheses at the 0.05 level of significance.

State the alternative hypothesis.

H(a): μ < 200

400

A recent study revealed that the average high school student spends about 200 minutes per day on Instagram. SLCS assumes students use less than this. Conduct a test of hypotheses at the 0.05 level of significance.

What tail will you look at to calculate probability?

Left Tail

400
As sample size increases, what happens to the standard error of the mean?
What is it decreases?
400
A recent study revealed that the average high school student spends about 200 minutes per day on Facebook with a standard deviation of 40 minutes. Here at FDA, we think our students spend less time on Facebook (because they're doing their homework...duh), and a sample of 100 students yielded an average time of 188 minutes. What is the p-value setup for this problem?
What is normalcdf(-1E99, -3, 0, 1)?
400
St. Patrick is from what country?
What is Scotland?
500

Studies show that the average person types 40 words per minute, but you don't believe it. A sample of 81 students at SLCS averaged 31 words per minute. Conduct a test of hypotheses at the 0.05 level of significance.

State the alternate hypothesis.

H(a): μ ≠ 40

500

Studies show that the average person types 40 words per minute, but you don't believe it. A sample of 81 students at SLCS averaged 31 words per minute. Conduct a test of hypotheses at the 0.05 level of significance.

What Z-Score bounds your tails?

Z = -1 or Z = 1

500
Is it better to take large or small samples? Why?
What is large samples, because larger samples mean a smaller standard error, which means less room for error in your overall probability calculations.
500
Studies show that the average person types 40 words per minute with a standard deviation of 18 minutes, but you don't believe it. A sample of 81 students at FDA averaged 31 words per minute. Conduct a test of hypotheses at the 0.05 level of significance. What is the p-value setup for this problem?
What is 2normalcdf(-1E99, -4.5, 0, 1)?
500
When we don't have a large sample size but still want to conduct a test of hypotheses, we can use a DIFFERENT TEST (not a Z-Test). What is this test called?
What is a T-Test?