Question

O-13 points 0/2 Submissions Used My Notes O A Your Teacher Application Exercise: Researchers hypothesire that a new oral contraceptive will produce welght gain. In a study, healthy females were weighed (b) at the beginning of a course of the new oral contracepthve. They were rewelghed at 2 months. What can the researchers conclude with a- 0.05? The data are below. Initial welght 2-month welght 140 150 11 144 13 141 144 163 158 147 147 145 145 148 151 140 144 a) What is the appropriate test statistic Select b) Condition 1: -Select- Condition 2: -Select c) Compute the appropriate test statistics) to make a decision about Hp (Hint: Make sure to write down the nul and altermatiive hypothees to help solve the problem.) critical value Decision: Select test statistic d) if appropriate, compute the CI. 3f not appropriate, input "na" for both spaces below e) Compute the corresponding effect sze(s) and indiicate magnitude(s) If not appropriate, input and/or select "na" below Select ect f) Make an anternretation based on the resuls MacBook Air

A) What is the appropriate test stat? N/A, z test, one sample t test, independent samples t test, related samples t test?

B. What are the conditons? 1 and 2.

choices: beginning, weight, 2 months, healthy females, new oral contraceptive

C. Compute test stat and make a decison.

critical value =

t stat =

decision:

D. Compute the CI

E. Cohens D=

r=

Magnitude sizes: trivial, small, med, or large

F. Make an interpretation based on results.

Signficant weight decrease in women

significant weight increase in women

no significant weight change

Answer 1

I have used minitab to perform paired t test for difference between means for before and after weight.

A. Paired t test because there are two related samples of same person before and after two month gap to study effect of new oral contraceptive.

Paired T-Test and CI: 2 month wt, Initial wt

Claim : New oral contraceptive will produce weight gain

Descriptive Statistics

Sample	N	Mean	StDev	SE Mean
2 month wt	10	144.80	10.97	3.47
Initial wt	10	140.20	11.05	3.50

Estimation for Paired Difference

Mean	StDev	SE Mean	95% Lower Bound for μ_difference
4.60	3.78	1.19	2.41

µ_difference: mean of (2 month wt - Initial wt)

Test

Null hypothesis	H₀: μ_difference = 0
Alternative hypothesis	H₁: μ_difference > 0

T-Value	P-Value
3.85	0.002

Conclusion : Since p value (0.002) is < 0.05, we will reject null hypothesis. Thus new oral contraceptive does produce any significant weight gain