|
Daily Steps |
Men (steps/day) |
Women (steps/day) |
|
|
X ± SD |
6602.05 ± 1889.20 |
7397.62 ± 2037.05 |
|
|
df = 18 |
SE = 878.56 |
||
Researchers were interested in whether there was a difference in physical activity (measured by average steps...
Researchers were interested in the teachers' perceptions of physical activity in children. They asked a sample of 10 elementary school grade 2 teachers to rate the physical activity level of the children in their class by filling in a questionnaire which asked about specific activities that they witness children participating in during a typical week. The questionnaire resulted in a class score out of 50 (scores could range from 0 to 50). The following is the data obtained by the...
A
physical therapist wanted to know whether the mean step pulse of
men was less than the mean step pulse of women she randomly
selected 60 men and 78 women to participate in the study each
subject was required to step up and down 6 inch platform the pulse
of each subject was then recorded the following results were
obtained
n Two sample T for Men vs Women N Mean StDev Men 60 112.2 11.5 Women 78 118.9 14.4 99%...
Dependent Sample T-Test Researchers were interested in studying whether the type of food eaten influences appearance perception. Participants were shown 2 pictures of a woman eating either fast food (i.e., a burger with fries) or healthier food (i.e., a salad). The participants were then asked to rate the woman’s level of attractiveness on a scale of 1 (very unattractive) to 7 (very attractive). Given the above information, answer the questions below (assume a level of significance of .05). State the...
researchers were interested in whether or not their new relaxation technique can help change test anxiety among college students who are taking a statistics class. researchers gather a random sample of college students. participants attend a relaxation training. participants then filled out the measure of test anxirty. this test is known to be standardized with a population mean of 50 and a standard deviation of 10. what is the lilikely alternative hypothesis for this experiment
what is the correct answer choice?
D Question 3 1 pts An instructor was interested in seeing if there was a difference in the average amount of time that men and women anticipate studying for an Introduction to Statistics course in the summer. A group of men and women were randomly selected from the University of Florida. The Minitab results are below. What is the best interpretation of the results below? Difference mu (F)- mu (M) T-Test of difference =...
21) A researcher wants to know whether there is a difference in the physical activity level of children during the morning and afternoon. He observes a total of 40 children (20 boys and 20 girls) from randomly selected schools during morning and afternoon recess and gives each child a score (out of 50) based on how much of the time they spend sitting, standing, walking or running. Each child receives a score in the morning and another in the afternoon....
Chapter 7-23. Chapter 7-25 Chapter 7-29 Chapter 7-33. Chapter 8 17 Researchers were interested in determining whether women are increasing their folc acid intake after a positive pregnancy test. The average folic acid intake is 150 mcg. Using the information below, answer the following questions. Using the data below, answer the following questions. I. What is the null and alternate hypotheses? 2. Indicate the sample size. 3, Indicate the sample mean. 4. Indicate the sample standard deviation. 5. Indicate the...
Researchers wanted to know if the levels of algae in a pond were hazardous to the fish that lived there. If the average levels are above 30 parts per million (ppm) the pond would be considered hazardous to the health of the fish. In the study with a 5% significance level, researchers collected data and found that the sample mean from 60 samples was 30.829. If σ = 34 , H 0: m u = 30 ; H a: μ <...
Researchers were interested whether students self-identifying as conservative or liberal at a local community college differed on Grade Point Average (GPA). The sample data were entered into a statistical software program, and the output for the F test is shown below. To compare the two means, would it be appropriate to use a t test that assumes equal variances? F-Test Two-Sample for Variances Conservative Liberal Mean 3.156 3.182 Variance 0.26 0.24 Observations 45 113 df 44 112 F 1.0827 P(F<=f)...
In a study on the physical activity of people, researchers measured overall physical activity as the total number of registered movements (counts) over a period of time and then computed the number of counts per minute (cpm) for each subject. The study revealed that the overall physical activity of obese people has a mean of μ=322cpm and a standard deviation σ=92cpm. In a random sample of 100 obese people, consider x ̅, the sample mean counts per minute. 1) Which...