Home
Blog
Statistics Help Now

Statistics Help Now

Daniel Kevins

0 comments

Part 1 of 3 –

Question 1 of 20

1.0 Points

If a teacher is trying to prove that a new method of teaching economics is more effective than a traditional one, he/she will conduct a:

Reset Selection

Question 2 of 20

1.0 Points

Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance.

What is your conclusion?

Reset Selection

Question 3 of 20

1.0 Points

A type II error occurs when:

Reset Selection

Question 4 of 20

1.0 Points

A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample. The target accuracy is a variance in measurements of 1.2 or less. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2.2, does this provide enough evidence to reject the claim that the lab technician’s accuracy is within the target accuracy?

At the a = .01 level of significance, what is your conclusion?




Reject H₀. At the $f$alpha f$$ = .01 level of significance, there is not enough evidence to support the claim that this technician’s true variance is larger than the target accuracy.

Reset Selection

Question 5 of 20

1.0 Points

Smaller p-values indicate more evidence in support of the:

Reset Selection

Question 6 of 20

1.0 Points

The form of the alternative hypothesis can be:

Reset Selection

Question 7 of 20

1.0 Points

The “Pizza Hot” manager commits a Type I error if he/she is

Reset Selection

Question 8 of 20

1.0 Points

Compute the value of the appropriate test statistic.

Reset Selection

Question 9 of 20

1.0 Points

What is the p-value associated with your test of hypothesis?

Reset Selection

Question 10 of 20

1.0 Points

In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 with a sample standard deviation of 7.

State the null and alternative hypotheses.

Reset Selection

Question 11 of 20

1.0 Points

Which of the following values is not typically used for $f$alpha f$$ ?

Reset Selection

Part 2 of 3 –

Question 12 of 20

1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), “E” or “e” (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where “a” and “b” need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

The ABC battery company claims that their batteries last 100 hours, on average. You decide to conduct a test to see if the company’s claim is true. You believe that the mean life may be different from the 100 hours the company claims. You decide to collect data on the average battery life (in hours) of a random sample of n = 20 batteries. Some of the information related to the hypothesis test is presented below.

Test of H₀: $f$mu f$$ = 100 versus H₁: $f$mu eq f$$ 100
Sample mean 98.5
Std error of mean 0.777

Assuming the life length of batteries is normally distributed, what is the p-value associated with this test? Place your answer, rounded to 3 decimal places in the blank. For example, 0.234 would be a legitimate entry.

Reset Selection