Question

It is recommended that a study has 200 participants. Only 80 participants signed up. If the...

It is recommended that a study has 200 participants. Only 80 participants signed up. If the study does continue with the 80 participants what should the researchers worry about? Alpha error, power error, type I error or type II error.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Correct option:

Power Error

Explanation:

Power = 1 - ,

where is the Type II Error, the probability of failing to reject the null hypothesis when the null hypothesis is not true.

So, if the Sample Size = n becomes smaller from 200 participants to 80 participants, the Standard Error becomes large. Thus. sampling distribution becomes wider. Thus, becomes large. Thus, Power becomes small.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
7. Which study will require a larger sample size, one done with 80% power or 90%...
7. Which study will require a larger sample size, one done with 80% power or 90% power when alpha (type I error) is set at 0.05 and we use the same population and expected difference and variation for both studies?
In a study about dieting and weight loss, N=80 subjects were gathered to participate. All of...
In a study about dieting and weight loss, N=80 subjects were gathered to participate. All of the participants were approximately 20-25% overweight (from their ideal weight), with no habits of exercising. The researchers randomly assigned these participants into four different categories: participants in Category I (N=20) ate the traditional low-caloric diet, participants in Category II (N=20) ate the ketogenic diet, participants in Category III (N=20) were told to eat whatever they want as if they were not on a diet...
The National Cancer Institute conducted a 2-year study to determine whether cancer death rates for areas...
The National Cancer Institute conducted a 2-year study to determine whether cancer death rates for areas near nuclear power plants are higher than for areas without nuclear facilities. A spokesperson for the Cancer Institute said, "From the data at hand, there was no convincing evidence of any increased risk of death from any of the cancers surveyed due to living near nuclear facilities.” (1 points for each)    Let p denote the proportion of the population in areas near nuclear...
The National Cancer Institute conducted a 2-year study to determine whether cancer death rates for areas...
The National Cancer Institute conducted a 2-year study to determine whether cancer death rates for areas near nuclear power plants are higher than for areas without nuclear facilities. A spokesperson for the Cancer Institute said, "From the data at hand, there was no convincing evidence of any increased risk of death from any of the cancers surveyed due to living near nuclear facilities.” (1 points for each)    Let p denote the proportion of the population in areas near nuclear...
1. When researchers conclude that their hypotheses are supported based on samples, when in reality the...
1. When researchers conclude that their hypotheses are supported based on samples, when in reality the hypotheses are not true of the populations, the researchers have made __________________. critical value errors Type IV errors Type II errors 2. Statisticians do not rely on the results of one study; thus, _____________ is central to the connection between research and understanding. correlation power error variance replication 3. Anna has conducted a study to test the hypothesis that fear correlates to the number...
Statistical power analysis seeks to optimize the size of the ___________. difference sample population correlation Statistical...
Statistical power analysis seeks to optimize the size of the ___________. difference sample population correlation Statistical power is the likelihood that an effect will be detected in the sample when one ____________. is hypothesized to exist has been found in previous research really exists exists in a previous sample of the same population The probability of failing to detect an effect when one exists is known as a _______. Type I error Type II error Power Standardized error Which of...
Question 3 A study aims to determine the incidence of type 2 diabetes. A cohort of...
Question 3 A study aims to determine the incidence of type 2 diabetes. A cohort of 200 people age 65 years or older who were initially disease –free participated in the study. One hundred and fifty people were examined at the end of 3 years. Fifty other participants from the initial cohort could not be examined, including 11 people who had died. Does this loss of participants represent a source of bias? Justify your answer. [4 points] Question 4 A...
A team of researchers has developed a new drug to treat atopic dermatitis, also known as...
A team of researchers has developed a new drug to treat atopic dermatitis, also known as eczema. They want to know if this new drug procedures better results than a commonly prescribed older drug. The side effects of the two drugs are equivalent. The new drug would be more expensive to produce compared to the older drug. To address their research question, they will randomly assign patients to either the new or old drug. Each patient will be examined by...
Sam decides he wants to know whether 45% of his customers own only one cat. a....
Sam decides he wants to know whether 45% of his customers own only one cat. a. Set up the null and alternative hypothesis (DO NOT TEST). b. If Sam wants to minimize the probability of making a type 2 error, should he set alpha equal to 0.05 or 0.01? Explain. c. In terms of the problem, what does it mean if he makes a type 1 error? d. What would be the consequences of making such an error?
Imagine that my study has a power of 0.60 to find a correlation of 0.30 or...
Imagine that my study has a power of 0.60 to find a correlation of 0.30 or higher. What does this 0.60 mean in probability terms? In what situation should we care the most about power?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT