# Statistics

#1- The normal distribution had a mean of 14 and standard deviation of 4. There were 30 people in the study group and the average was expected to be 16. The study was tested at the .05 level of significance. What was the power of the study?

74.2%
80.5%
86.4%
92.7%

#2- If a sample with a mean of 60 has an estimated effect size of 2, is that effect size small, medium, or large?

1. 👍
2. 👎
3. 👁

## Similar Questions

1. ### statistics

A consumer group wants to know if an automobile insurance company with thousands of customers has an average insurance payout for all their customers that is greater than \$500 per insurance claim. They know that most customers

2. ### stat

Which of the following statements is true about the t-distribution with k degrees of freedom? i. the t-distribution is symmetric ii. the t-distribution with k degrees of freedom has a smaller variance than the t-distribution with

3. ### statistics

Fast Auto Service provides oil and lube service for cars. It is known that the mean time taken for oil and lube service at this garage is 15 minutes per car and the standard deviation is 2.4 minutes. The management wants to

4. ### math 115

Let x be a continuous random variable that follows a normal distribution with a mean of 200 and a standard deviation 25. Find the value of x so that the area under the normal curve between ì and x is approximately 0.4798 and the

1. ### Stat

An SRS of size n is taken from a large population whose distribution of income is extremely right-skewed and the mean income is calculated. Which of the following statements is false? a) When n > 30, the sampling distribution of

2. ### stat

The mean of a normal probability distribution is 60; the standard deviation is 5

3. ### Math (Statistic)

Considered the sampling distribution of a sample mean obtained by random sampling from an infinite population. This population has a distribution that is highly skewed toward the larger values. a) How is the mean of the sampling

4. ### Statistics

The following is a histogram (right skewed) of the first ten terms of a geometric distribution with p = .4. The mean of this distribution is 2.5 and the standard deviation is approximately 1.93. What's the shape of the

1. ### statistics

Consider the standard normal distribution with mean μ = 0, and standard deviation σ = 1 a. What is the probability that an outcome z is greater than 2.20? b. What is the probability that z is less than 1.1? c. What is the

2. ### statistics

Consider a normal distribution with mean 20 and standard deviation 3. What is the probability a value selected at random from this distribution is greater than 20?

3. ### Statistics

The t distribution should be used when ___. the sampling population is not normal the sampling population is unimodal The sampling distribution is normal and the population standard deviation is unknown the population standard

4. ### Statistics

a normal distribution ha am ean of 80 with a standard deviation of 20. what score separates the highest 15% of the distribution from the rest of the score?