Question

Questions 7 to 13 are based on the following problem A researcher used a sample of n =16 adults between the ages of 40 and 45. For each person, the researcher recorded the difference between the ratings obtained while smiling and the rating obtained while frowning. On average the cartoons were rated as funnier when the participants were smiling, with an average difference of MD = 1.6, with SS = 135. Are the cartoons rated as significantly funnier when the participants are smiling ? Use a one-tailed test with α = .05. The null hypothesis in words is: Group of answer choices There is no significant difference between the two conditions: smiling and frowning There is a significant difference between the two conditions: smiling and frowning The cartoons were not rated as significantly funnier when the participants were smiling than when the participants were frowning. The cartoons were rated as significantly funnier when the participants were smiling than when the participants were frowning. The alternative hypothesis in symbols is: Group of answer choices H1: µ1= µ2 H1: µ1> µ2 H1: µD= 0 H1: µD≠ 0 H1: µD> 0 H1: MD = 1.6 H1: MD ≠ 1.6 H1: µD≤ 0 The critical t-value is Note: Include all the numbers after the decimal point. The t-statistic is Your decision is Group of answer choices Reject the null hypothesis because the t-statistic is greater than the critical t-value Reject the null hypothesis because the t-statistic is not greater than the critical t-value Fail to reject the null hypothesis because the t-statistic is greater than the critical t-value Fail to reject the null hypothesis because the t-statistic is not greater than the critical t-value Compute r2 to measure the size of the treatment effect. r2 is Report the results in APA. Include r2 as a measure of the effect size.

Answer #1

1a)
A researcher used a sample of n =16 adults
between the ages of 40 and 45. For each person, the researcher
recorded the difference between the ratings obtained while smiling
and the rating obtained while frowning. On average the cartoons
were rated as funnier when the participants were smiling, with an
average difference of MD = 1.6, with
SS = 135.
Are the cartoons rated as significantly funnier when the
participants are smiling ? Use a one-tailed test with...

A researcher used a sample of n= 25 adults between the
ages of 40 and 45. For each person, the researcher recorded the
difference between the ratings obtained while smiling and the
rating obtained while frowning. On average the cartoons were rated
as funnier when the participants were smiling, with an average
difference of MD = 1.6, with SS =
150.
Are the cartoons rated as significantly funnier when the
participants are smiling ? Use a one-tailed test
with α...

A researcher obtains a sample of n= 16 adults who are between
the ages of 65 and 75. The researcher measures cognitive
performance for each individual before and after a two-month
program in which participants receive daily doses of a blueberry
supplement. The results show an average increase in performance of
MD= 7.4, with SS = 1215. Does the result support the conclusion
that the blueberry supplement significantly increase cognitive
performance? Use a one-tailed test with α = .05
(A)...

1.a)A researcher obtains a sample of n= 25 adults who
are between the ages of 65 and 75. The researcher measures
cognitive performance for each individual before and after a
two-month program in which participants receive daily doses of a
blueberry supplement. The results show an average increase in
performance of MD= 8, with SS = 1200.
Does the result support the conclusion that the blueberry
supplement significantly increase cognitive performance? Use a
one-tailed test with α = .01
The...

Suppose a sample of 49 paired differences that have been
randomly selected from a normally distributed population of paired
differences yields a sample mean of d⎯⎯=5.9 and a sample standard
deviation of sd = 7.4. (a) Calculate a 95 percent confidence
interval for µd = µ1 – µ2. Can we be 95 percent confident that the
difference between µ1 and µ2 is greater than 0? (Round your answers
to 2 decimal places.) Confidence interval = [ , ] ; (b)...

Based on the APA formatted statements below, give the
type of research design (between subjects/within subjects), the
sample size, and the decision (reject the null hypothesis/fail to
reject the null hypothesis) in this study? NOTE: I need the three
pieces of information with steps.
A researcher develops an advertisement aimed at increasing how
much the public trusts a particular federal agency. She asks
participants to rate their level of trust for the organization
before and after viewing an advertisement. Higher...

Some researchers claim that herbal supplements improve human
memory. To test this claim, a researcher selects a sample of n = 25
college students. Each student is given herbal supplements daily
for 6 weeks and then all the participants are given a standardized
memory test. For the population, scores on the tests are normally
distributed with µ = 70 and σ= 15. The sample of n = 25 students
had a mean score of M = 75. Can we conclude...

A statistics teacher wants to assess whether her remedial
tutoring has been effective for her 16 students (n = 16). To
evaluate the changes that occur during the year, students’ grades
were measured at the beginning and at the end of the year. Their
grades revealed an average improvement of MD = 8 points with a sum
of squares for the difference scores of SSD = 930. Conduct the
appropriate hypothesis test to determine if the data are sufficient
to...

Questions 11 and 12 are based on the following information: An
investigation of the effectiveness of a training program to improve
customer relationships included a pre-training and post-training
customer survey, 12 customers were randomly selected to score the
customer relationships both before and after the training. The
differences of scores are calculated as the post-training survey
score minus the pre-training survey score. The sample mean
difference of scores is 0.5. The test statistic is 1.03 for testing
whether the population...

A researcher used an independent sample t test to compare two
treatment conditions. He wanted to test whether there is a
significant difference between two treatments. Following data were
obtained:
Treatment one group: # of participants = 12, sample mean = 55,
sample standard dev (s) = 2.83
Treatment two group: # of participants = 12, sample mean = 52,
sample standard dev (s) = 2.00
Use 5% significance level.
Assume µ1
and µ2 are the population means for group one
and...

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