### Test the hypotheses

Assignment Help Basic Statistics
##### Reference no: EM137736

1. Researchers compared two groups of competitive rowers: a group of skilled rowers and a group of novices. The researchers measured the angular velocity of each subject's right knee, which describes the rate at which the knee joint opens as the legs push the body back on the sliding seat. The sample size n, the sample means, and the sample standard deviations for the two groups are given below.

The researchers wished to test the hypotheses
H0:the mean knee velocities for skilled and novice rowers are the same.
Ha:the mean knee velocity for skilled rowers is larger than for novice rowers.
The data showed no strong outliers or strong skewness so the researchers decided to use the two-sample t test. The value of the t test statistic is

A. 3.38.
B. 4.00.
C. 16.00.

2. We would like to know the average amount of time students spend studying for their classes each week. A random sample of 100 students are surveyed. They reported spending an average of 7.6 hours studying, with s = 1.2 hours. Based on these data, find a 95% confidence interval for the average amount of time a student studies for classes each week.

A. (7.40, 7.80)
B. (7.36, 7.84)
C. (4.82, 9.58)

3. Researchers compared two groups of competitive rowers: a group of skilled rowers and a group of novices. The researchers measured the angular velocity of each subject's right knee, which describes the rate at which the knee joint opens as the legs push the body back on the sliding seat. The sample size n, the sample means, and the sample standard deviations for the two groups are given below.

The correct test to use to decide if there is a difference in mean leg velocities is a
A. two-sample z test.
B. two-sample t test.
C. pooled two-sample t test.

#### Questions Cloud

 Evaluate the confidence interval : The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a, When testing whether or not the increases in spending are different, the test is .. Water displacement method : Each egg was also measured for volume using a water displacement method. We wanted to know if the two methods agreed or not Evaluate the standard deviation : Evaluate the standard deviation - use the conservative value for the degrees of freedom, Assume the two groups are independent and the data are approximately Normal. Let µ 1 and µ 2 represent the mean heart rates we would observe for the entire po.. Standard deviations for first- and second-time : Standard deviations for first- and second-time and confidence interval Test the hypotheses : The sample size n, the sample means, and the sample standard deviations for the two groups are given Confidence interval : Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores What conclusion can be made from this study : It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. The null hypothesis of equality of means is rejected. What conclusion can be made f.. Freedom for the two-sample t procedures : It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. These data should be analyzed with a The standard error of the difference in sample means : Find the standard error of the difference in sample means,

### Write a Review

#### P-value to test hypotheses

P-value to test hypotheses,

#### What is the probability that no student wins

The random variable X has which of the following probability distributions and What is the probability that no student wins

#### Caselet on mcdonald’s vs. burger king - waiting time

Caselet on McDonald’s vs. Burger King - Waiting time

#### What is the minimum score

A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is

#### Find a simple random sample of 50 freshmen

They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.

#### Find the shape of this distribution

The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately.

#### Find the confidence interval for the mean

How strong is the evidence against the company's claim? Based on these data, the P -value of the appropriate test

#### Describe the sampling distribution of the sample proportion

Describe the sampling distribution of the sample proportion

#### Prepare a power curve for this decision rule

Prepare a power curve for this decision rule

#### What is the mean and standard deviation

What is the mean and standard deviation of the number preferring the incumbent and what is the probability that more than 68% will favor the incumbent?

#### Mean time to complete the entire homework assignment

Which of the following Venn diagrams has shaded the event that the contractor wins exactly one of the contracts and evaluate the mean time to complete the entire homework assignment

#### Calculate descriptive statistics for each stock

Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.