Question

You are a biomedical researcher and you want to know if the consumption of alcohol during...

You are a biomedical researcher and you want to know if the consumption of alcohol during

pregnancy affects the birthweight of babies. You know that the average birthweight for babies in the U.S. is m = 7.5 pounds. You draw a random sample of 16 infants whose mothers indicated that they regularly consumed alcohol during pregnancy. The sample had a mean of 6.50 and a standard deviation of 1.50.

a.            State the null hypothesis.

b.            Identify the appropriate statistical test

c.             Calculate the appropriate test statistic. Make sure to report the degrees of freedom for

the statistical test (if appropriate). You must show your work to receive full credit.

d.            State your conclusions (use a two-tailed test with a = .05 for all tests).

e.            Compute an effect size.

Homework Answers

Answer #1

Solution-A:

Ho:

Ha:

Soution-B;

since population standard deviation is not known and n=16

perform t test for mean

Solution-c:

t=xbar-mu/s/sqrt(n)

=(6.50-7.50)/(1.50/sqrt(16))

t= -2.666667

df=n-1=16-1=15

p value for two tail t test is

=T.DIST.2T(2.666667,15)

=0.017595141

p<alpha

Reject Ho

Solution-d:

there is suffcient statistical evidence at 5% level of significance to conclude that

the consumption of alcohol during

pregnancy affects the birthweight of babies.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A researcher knows that the weights of 6 year olds are normally distributed with μ =...
A researcher knows that the weights of 6 year olds are normally distributed with μ = 20 kg and σ = 5.0. She suspects that children in poverty-stricken regions differ from the population. With a sample of n = 25 children, the researcher obtains a mean of 17 kg.   a. State the null hypothesis. b. Identify the appropriate statistical test c. Calculate the appropriate test statistic. Make sure to report the degrees of freedom for the statistical test (if appropriate)....
A researcher is interested in the relationship between one’s satisfaction with pay (X) and one’s commitment...
A researcher is interested in the relationship between one’s satisfaction with pay (X) and one’s commitment to the organization (Y). The researcher collects data from 24 employees and finds that the correlation between the two variables is r = 0.22. a. State the null hypothesis. b. Identify the appropriate statistical test c. Calculate the appropriate test statistic. Make sure to report the degrees of freedom for the statistical test (if appropriate). You must show your work to receive full credit....
Use either the critical value or the P-value method you are not required to use both....
Use either the critical value or the P-value method you are not required to use both. State the claim and the hypothesis. Find the critical value(s) and describe the critical (rejection) region You can choose to use the P-value method in this case state the P-value after the test value. Compute the test value (statistic) Make a decision Summarize the results (conclusion) A study was conducted of babies born to mothers who use cocaine during pregnancy, and the following sample...
For each of the following exercises: For each test use either the critical value or the...
For each of the following exercises: For each test use either the critical value or the P-value method you are not required to use both. a.) State the claim and the hypothesis. b.) Find the critical value(s) and describe the critical (rejection) region You can choose to use the P-value method in this case state the P-value after the test value. c.) Compute the test value (statistic) d.) Make a decision e.) Summarize the results (conclusion) A study was conducted...
a.            State the null hypothesis. b.            Identify the appropriate statistical test c.       &n
a.            State the null hypothesis. b.            Identify the appropriate statistical test c.            Calculate the appropriate test statistic. Make sure to report the degrees of freedom for the statistical test (if appropriate). You must show your work to receive full credit. d.            State your conclusions (use a two-tailed test with a = .05 for all tests). e.            Compute an effect size. A researcher knows that the weights of 6 year olds are normally distributed with m = 20 kg and s...
A therapist would like to evaluate an intervention for treating depression. A sample of n =...
A therapist would like to evaluate an intervention for treating depression. A sample of n = 20 depressed clients is obtained, and each person’s level of depression is measured using a standardized questionnaire before they begin the therapy program. Two weeks after therapy, each client’s level of depression is measured again. The average level of depression dropped by 4.0 points following therapy. The difference scores had a variance of 64. a. State the null hypothesis. b.            Identify the appropriate statistical...
A psychologist is examining the educational advantages of a preschool program. A sample of 16 fourth...
A psychologist is examining the educational advantages of a preschool program. A sample of 16 fourth grade children is obtained. Half of these children (n = 8) attended preschool and the others (n = 8) had not. The psychologist records the scholastic achievement score for each child. Preschool No Preschool 12 11 20 14 15 18 18 8 22 12 10 13 14 16 17 8 a.            State the null hypothesis. b.            Identify the appropriate statistical test c.             Calculate the...
A therapist would like to evaluate an intervention for treating depression. A sample of n =...
A therapist would like to evaluate an intervention for treating depression. A sample of n = 20 depressed clients is obtained, and each person’s level of depression is measured using a standardized questionnaire before they begin the therapy program. Two weeks after therapy, each client’s level of depression is measured again. The average level of depression dropped by 4.0 points following therapy. The difference scores had a variance of 64. a. State the null hypothesis. b. Identify the appropriate statistical...
2a.) You want to know if people's age (in years) is related to the amount of...
2a.) You want to know if people's age (in years) is related to the amount of time they spend on social media (hours per week). You collect a sample of 200, and measure both variables. What kind of statistical test does this call for? ANOVA Independent Samples t-test Correlation Chi-square for independence Single Mean Dependent Samples t-test Chi-square for goodness of fit 2b.) Then Imagine you have conducted the appropriate test for the above design, with α = .05 and...
A recent study of newborns used umbilical cord blood to test for 25 hydroxyvitamin D, which...
A recent study of newborns used umbilical cord blood to test for 25 hydroxyvitamin D, which is an indicator of vitamin D status of the baby. It was reported that 65% of babies tested were deficient in vitamin D in spite of the fact that the mother consumed vitamin D supplements during pregnancy. A researcher in a northern region felt that this percentage should be lower for this region because with reduced hours of sunshine during winter months, pregnant women...