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In: Math
A researcher would like to determine whether an over-the-counter herbal nasal spray has an effect on...
A researcher would like to determine whether an over-the-counter herbal nasal spray has an effect on mental alertness for infants. A sample of n = 16 infants is obtained, and each baby is given a standard dose of the spray one hour before being tested for mental alertness. For the general population of infants, scores on a mental alertness screening test are normally distributed with μ = 60. The infants in the sample had an average score of M = 56.5 and an s = 8.
Can the researcher conclude that scores on the screening test are significantly different after administering the spray? Use a two-tailed test with α = .05. Be sure to state your null hypothesis, a decision about that null hypothesis, and a conclusion explaining your results with an APA format statement. Calculate Cohen’s d if necessary.
Solutions
milcah answered 5 months agoRelated Solutions
A researcher would like to determine whether an over-the-counter herbal nasal spray has an effect on...
A researcher would like to determine whether an
over-the-counter herbal nasal spray has an effect on mental
alertness for infants. A sample of n = 18 infants is obtained, and
each baby is given a standard dose of the spray one hour before
being tested for mental alertness. For the general population of
infants, scores on a mental alertness screening test are normally
distributed with μ = 60. The infants in the sample had an average
score of M =...
A researcher would like to determine whether a new tax on cigarettes has had any effect...
A researcher would like to determine whether a new tax on
cigarettes has had any effect on people’s behavior. During the year
before the tax was imposed, stores located in rest areas on the
state thruway reported selling an average of µ = 410 packs per day
with σ = 60. The distribution of daily sales was approximately
normal. For a sample of n = 9 days following the new tax, the
researcher found an average of M = 386...
A researcher wants to determine whether or not a given drug has any effect on the...
A researcher wants to determine whether or not a given drug has
any effect on the score of a human subject performing a task of ESP
sensitivity. He randomly assigns his subjects to one of two groups.
900 subjects in group 1 (treatment group) receive the drug. In
contrast, 1000 subjects in group 2 (control group) receive a
placebo. For the drug group, the mean score on the ESP test was 15,
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A researcher for a yogurt manufacturer would like to determine whether adult consumers showed any preference...
A researcher for a yogurt manufacturer would like to determine
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yogurt products that the company recently developed, as one will be
marketed as “organic” and the other without the organic
designation. To start, a small sample of adults was obtained (n =
9), and on Day 1, given the organic yogurt to eat. The next day,
the same 9 adults were given the non-organic yogurt to eat, with
the same instructions...
A researcher would like to examine the effect of labor unions on the average pay of...
A researcher would like to examine the effect of labor unions on
the average pay of workers. The investigator obtains information
from the National Carpenters Union, which states that the average
pay for union carpenters is μ=$7.80 per hour. The researcher then
obtains a random sample of 8 carpenters who do not belong to a
union and records the pay for each. The data from this sample are
as follows: 6.25, 7.50, 6.75, 6.90, 7.10, 7.15, 8.00, 6.15 per
hour....
A researcher would like to determine if relaxation training will affect the number of headaches for...
A researcher would like to determine if relaxation training will
affect the number of headaches for chronic headache sufferers (n =
8). A week before training, each participant recorded the number of
headaches experienced. Participants then receive relaxation
training and following training the number of headaches were
recorded again. The following results were provided:
ΣD = -16
SS = 14
Determine whether the results indicate a significant difference
in chronic headaches after relaxation training? Use an alpha .05,
level of...
A researcher would like to determine if relaxation training will affect the number of headaches for...
A researcher would like to determine if relaxation training will
affect the number of headaches for chronic headache sufferers. For
a week prior to training, each participant records the number of
headaches suffered. Participants then receive relaxation training
and for the week following training the number of headaches is
again measured. The change in number of headaches before and after
training is as follows (minus signs indicate a reduction from time
one to time 2):
Difference scores: -5 -1 ...
A researcher would like to determine if relaxation training will affect the number of headaches for...
A researcher would like to determine if relaxation training will
affect the number of headaches for chronic headache sufferers. For
a week prior to training, each participant records the number of
headaches suffered. Participants then receive relaxation training
and for the week following training the number of headaches is
again measured. (18 points) The data are as follows: MD = 2.25, s =
1.28
a) What is the null hypothesis
for this experiment?
b) What is the alternative
hypothesis for this experiment?...
A researcher would like to know whether there is a significant relationship between Verbal skills and...
A researcher would like to know whether there is a significant
relationship between Verbal skills and Math skills in population of
high school students. A sample of n = 200 students is
randomly selected and each student is given a standardized Verbal
skills test and a standardized Math skills test.
Based on the test results, students are classified as High or
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The results are summarized in the following frequency
distribution table (i.e., the...
A researcher would like to test whether or not people who have stocked up on a...
A researcher would like to test whether or not people who have
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stress during a statewide stay-at-home order. A statewide poll
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population is 60.5 (with a standard deviation of 11.6) and is
normally distributed. Using a random sample of 36 toilet paper
hoarders that have a mean stress level of 54.7 (and a standard
deviation of 10.3), test...
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