Question

In: Statistics and Probability

1. A sports scientist collects strength data from two groups of students. The first group is...

1. A sports scientist collects strength data from two groups of students. The first group is a group of athletes who might be expected to be strong, and the second group is a control group of nonathletic students. The first group has strength ratings of: c(129.4, 111.8, 127.7, 130, 120.7, 118.2, 121.9) And the second group has strength ratings of: c(149.1, 111.6, 122.1, 126.4, 123.3, 105.5, 127.3, 101.2, 113.3 ) Is there evidence that the first group is actually stronger than the second?

(a) State a sensible null hypothesis

(b) Is a one-sided or two-sided test needed? justify

(c) Perform a student t-test using R and interpret

Solutions

Expert Solution

orchestra answered 1 year ago
Next > < Previous

Related Solutions

1. A scientist collects fish from two lakes. The first lake is known to have large...
1. A scientist collects fish from two lakes. The first lake is known to have large fish and the second is known to have small fish. The fish caught from the first lake have weights, in grams, of: c(41.4, 35.9, 35.7, 29.9, 48.3, 36.7, 37.2, 29.7, 45.5) and fish caught from the second lake has weights of: c(41.9, 35.4, 35.4, 23.9, 34.4, 39.9, 34.2, 42.3) Is there evidence that the first group is actually more active than the second? （Pls...
Don't involve regression A scientist collects fish from two lakes. The first lake is known to...
Don't involve regression A scientist collects fish from two lakes. The first lake is known to have large fish and the second is known to have small fish. The fish caught from the first lake have weights, in grams, of: c(48.2, 45.9, 34, 52.9, 29.8, 45.4, 35.2, 42.2) and fish caught from the second lake has weights of: c(55.3, 39.7, 45.9, 34.7, 37.1, 49.7, 12, 37.7, 45.6, 59.2) Is there evidence that the first group is actually more heavy than...
In a test given to two groups of students to marks were as follows: First group:...
In a test given to two groups of students to marks were as follows: First group: 9, 11, 13, 11, 15, 9, 12, 14 Second group: 10, 12, 10, 14, 9, 8, 10 Examine the significance of difference μ1-μ2 under the assumption on the samples are drawn from normal population with σ12=σ22.
1. An impartial judge of a local garden competition collects scores from two groups of judges...
1. An impartial judge of a local garden competition collects scores from two groups of judges on what he suspects to be the number one garden. He finds the first group (n = 5) has a mean score of 76. The second group (n = 3) has a mean score of 91. So that he may declare the final score, what is the weighted mean of these two groups? 2. A social scientist measures the number of minutes (per day)...
Two groups were selected for an experiment. The sample data is reported: Group A Group B...
Two groups were selected for an experiment. The sample data is reported: Group A Group B Sample Mean Spending/day ($) 170 150 Sample Standard deviation ($) 10 5 # of Females 9 7    Sample Size 36 42 a. Set up a 99% confidence interval for the mean difference in spending between the two groups. b. At the 10% level test the alternate hypothesis that group B has lower spending level than Group A.
A firm sells its product to two groups of customers. Demand from group 1 is Q1...
A firm sells its product to two groups of customers. Demand from group 1 is Q1 = 100, 000− 5,000P and demand from group 2 is Q2 = 140,000 − 10,000P. a) Find the total demand that the firm faces for its product. Explain it first using pictures, and then do the algebra. Write your answer of the total demand as quantity as a function of price. (Hint: draw pictures. Then add the two demands horizontally; that is, at each...
College students were randomly sorted into one of two groups. Members of each group performed a...
College students were randomly sorted into one of two groups. Members of each group performed a series of mental tasks while music was playing in the background. One group listened to pop music and the other to country music. It is hypothesized that music will effect the number of tasks completed. What can be concluded with an α of 0.10? The results are below: pop country 1 = 39.31 1 = 5.43 n1 = 10 2 = 44.15 2 =...
College students were randomly sorted into one of two groups. Members of each group performed a...
College students were randomly sorted into one of two groups. Members of each group performed a series of mental tasks while music was playing in the background. One group listened to pop music and the other to country music. It is hypothesized that more tasks will be completed with pop than with country music. What can be concluded with α = 0.05? The results are below: pop country mean 1 = 47.14 sigma hat 1 =3.77 n1 = 15 mean...
College students were randomly sorted into one of two groups. Members of each group performed a...
College students were randomly sorted into one of two groups. Members of each group performed a series of mental tasks while music was playing in the background. One group listened to pop music and the other to country music. It is hypothesized that music will influence the number of tasks completed. What can be concluded with an α of 0.10? The results are below: pop country 1 = 34.34 1 = 5.33 n1 = 16 2 = 37.05 2 =...
Two different teaching procedures were used on two different groups of students. Each group contained 100...
Two different teaching procedures were used on two different groups of students. Each group contained 100 students of about the same ability. At the end of the term, an evaluating team assigned a letter grade to each student. The results were tabulated as follows: Grade Group A B C D F Total Total (I) 15 22 32 17 14 100 (II) 9 16 29 28 18 100 If we consider this data to be comprised of independent observations, test at...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT