(Answered) Question researchers asked a sample of 50 1st grade

Statistics

Question: Researchers asked a sample of 50 1^st grade teachers and a sample of 50 12^th grade teachers how much of their own money they spent on school supplies in the previous school year. They wanted to see if teachers at one grade level spend more than teachers at the other grade level.

a. What type of study is found-observational or randomized experiment? Explain.

b. What is the experimental (or observational) unit?

c. What is the response variable?

d. What is the explanatory variable?

e. Do we have to worry about confounding variables in this instance? Why? If so identify a possible confounding variable?

f. Are either of the terms retrospective study or prospective study relevant? Explain.

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9953255
Price:- $20

Verified Expert

Priced at $40 Now at $20, Verified Solution

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

The monthly sales demand for a new product is uncertain but

The monthly sales demand for a new product is uncertain, but it is considered to be adequately described by a normal random variable with mean 50,000 units and variance 100,000,000. (a) A factory to manufacture the new p ...

You are promised 80 a year for the next 4 years you are

You are promised $80 a year for the next 4 years. You are also promised a one-time payment of $2000 in 6 years. The interest rate is 6%. What is the total PV?

A die is rolled four times what is the probability that the

A die is rolled four times. What is the probability that the sum of four numbers equals 13?

In a survey of 3439 adults 1418 say they have started

In a survey of 3439 adults, 1418 say they have started paying bills online in the last year. Construct a? 99% confidence interval for the population proportion. Interpret the results.

Follow up -lock box systems or regional collection

Follow Up -Lock Box Systems or Regional Collection Centers One way a business can speed up collections is Lock Box Systems or Regional Collection Centers. Explain how these can be used to speed up collections.

Using chebysheffs theorm you have concluded that at least

Using Chebysheff's theorm, you have concluded that at least 77.66% of the 3,075 runners took between 60.5 and 87.5 minutes to complete the 10km race. What was the standard deviation of these 3,075 runners?

Let x be a random variable with range rx -1 0 1 and let px

Let X be a random variable with range RX = {-1, 0, 1} and let P(X = 1) = P(X = -1) = p/2 for some p ∈ [0, 1]. a) Compute P(X = 0). b) Compute the expectation E[X] and variance Var(X) of X as a function of p, and determin ...

What are the ways that it can help comply with legal

What are the ways that IT can help comply with legal requirements and social responsibilities surrounding the sales of alcohol?

On average the parts from a supplier have a mean of 975

On average, the parts from a supplier have a mean of 97.5 inches and a standard deviation of 6.1 inches. Find the probability that a randomly selected part from this supplier will have a value between 85.3 and 109.7 inch ...

Transaction costs you would like to purchase one class a

Transaction costs You would like to purchase on?e Class A share of Berkshire Hath-away through your Scottrade brokerage account. Scottrade charges a $7 commission for online trades. You log into your account, check the r ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert