Question
In: Statistics and Probability
A researcher wanted to know whether losing one night sleep can affect problem solving. A sample...
A researcher wanted to know whether losing one night sleep can affect problem solving. A sample of n = 25 college students was given a problem-solving task at noon on one day and again at noon on the following day. The students were not permitted any sleep between the two tests. For each student, the difference between the first and the second score was recorded: MD = 4.7 and standard deviation of the difference score was s = 8.
Do the data indicate a significant change in problem solving ability? Use a two-tailed testwith α = .05.
1. The null hypothesis in words is?
2. The alternative hypothesis in symbols is?
3. The critical t-values are?
4. The t-statistic is?
5. Your decision is? Reject the null hypothesis of Fail to reject?
6. Estimated Cohen’s d is?
Solutions
orchestra answered 2 years agoRelated Solutions
1 A researcher wanted to know whether losing one night sleep can affect problem solving. A...
1
A researcher wanted to know whether losing one night sleep can
affect problem solving. A sample of n = 25 college
students was given a problem-solving task at noon on one day and
again at noon on the following day. The students were not permitted
any sleep between the two tests. For each student, the difference
between the first and the second score was recorded:
MD = 5 and standard deviation of the difference
score was s = 10....
A researcher calculated average sleep hours per night for a random sample of (n= 5454) students....
A researcher calculated average sleep hours per night for a
random sample of (n= 5454) students. The researcher hypothesised
that a healthy person is expected to sleep 8.58.5 hours per night
(μ0=8.5μ0=8.5). The sample mean y¯y¯ is equal to 8.28.2 hours and
the sample variance s2n−1sn−12 is equal to 1.181.18 hours.
Research Question: Is the average hours of sleep equal to
hypothesised hours of sleep per night?
Answer the following questions by choosing the most correct
option or typing the...
A researcher calculated average sleep hours per night for a random sample of (n= 4646) students....
A researcher calculated average sleep hours per night for a
random sample of (n= 4646) students. The researcher hypothesised
that a healthy person is expected to sleep 88 hours per night
(μ0=8μ0=8). The sample mean y¯y¯ is equal to 7.97.9 hours and the
sample variance s2n−1sn−12 is equal to 1.241.24 hours.
Research Question: Is the average hours of sleep equal to
hypothesised hours of sleep per night?
Answer the following questions by choosing the most correct
option or typing the...
Question 1: A researcher wants to know whether supplements affect how long the undead can go...
Question 1: A researcher wants to know whether supplements
affect how long the undead can go without requiring human blood. To
investigate this, she took one sample of vampires and one sample of
zombies. Half the vampires and half the zombies received a placebo,
while the other half of vampires and zombies received a supplement.
She then recorded how many days the vampires and zombies could go
without feeding. The goal of the study was to investigate three
different things:...
Dr. Kovaleski is interested in examining whether quantity of sleep impacts problem solving ability. To test...
Dr. Kovaleski is interested in
examining whether quantity of sleep impacts problem solving
ability. To test problem solving ability, the research team gave
participants a puzzle and measured how long it took participants to
solve the puzzle in minutes. A group of participants were
instructed to sleep 5 hours and then solve the puzzle in the
morning. Then the same participants were instructed to sleep 7
hours and then solve a different puzzle in the morning. Then,
participants were asked...
Dr. Kovaleski is interested in examining whether quantity of sleep impacts problem solving ability. To test...
Dr. Kovaleski is interested in examining whether quantity of
sleep impacts problem solving ability. To test problem solving
ability, the research team gave participants a puzzle and measured
how long it took participants to solve the puzzle in minutes. A
group of participants were instructed to sleep 5 hours and then
solve the puzzle in the morning. Then the same participants were
instructed to sleep 7 hours and then solve a different puzzle in
the morning. Then, participants were asked...
A survey was conducted to determine whether hours of sleep per night are independent of age. A sample of individuals was asked to indicate the number of hours of sleep per night with categorical option
A survey was conducted to determine whether hours of sleep per night are independent of age. A sample of individuals was asked to indicate the number of hours of sleep per night with categorical options: fewer than 6 hours, 6 to 6.9 hours, 7 to 7.9 hours, and 8 hours or more. Later in the survey, the individuals were asked to indicate their age with categorical options: age 39 or younger and age 40 or older. Sample data follow....
The National Sleep Foundation used a survey to determine whether hours of sleep per night are...
The National Sleep Foundation used a survey to determine whether
hours of sleep per night are independent of age (Newsweek, January
19, 2004). A sample of individuals was asked to indicate the number
of hours of sleep per night with categorical options: fewer than 6
hours, 6 to 6.9 hours, 7 to 7.9 hours, and 8 hours or more. Later
in the survey, the individuals were asked to indicate their age
with categorical options: age 39 or younger and age...
A researcher wants to know whether supplements affect how long vampires can go without requiring human...
A researcher wants to know whether supplements affect
how long vampires can go without requiring human blood. She took
one sample of vampires (n = 10). Half received a placebo first and
the supplement second, while the other half received the sup-
plement first and the placebo second. She then recorded how many
days the vampires could go without consuming human blood for each
condition. The goal of the study was to see whether there would be
any difference between...
A researcher wanted to know whether people drive faster in sports cars or pick up trucks....
A researcher wanted to know whether people drive faster in
sports cars or pick up trucks. He went out on the freeway with a
radar gun and track the speed of people in both types of cars. A
sample of n=30 sport car drivers went an average of M=69 (s=5.35)
whereas a sample n=30 pick up truck drivers wet an average of M=67
9 (s=5.30). What statistics should be run? Calculate Harlteys
F-Max, one-tailed to two-tailed test, calculate confidence interval...
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