Mathematics, 13.11.2019 00:31, nickydeuce3
Aresearcher 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 test with α = .05.
a)
the null hypothesis in words is :
problem solving ability improves after losing on night sleep
problem solving ability is reduced after losing one night of sleep
there is no significant difference in problem solving ability between the two conditions: before and after losing one night of sleep
there is a significant difference in problem solving ability between the two conditions: before and after losing one night of sleep
b)
the alternative hypothesis in symbols is:
h1: µ1≠ µ2
h1: µ1> µ2
h1: µd= 0
h1: µd≠ 0
h1: µd> 0
h1: md = 4.7
h1: md ≠ 4.7
h1: µd≤ 0
c)
the critical t-values are:
±2.064
±2.797
±1.711
±2.492
d)
the t-statistic is ?
( if it is a decimal number with two or more than two places, leave only two decimal places after the decimal point. do not round. )
e)
your decision is:
reject the null hypothesis and conclude that losing one night sleep did not affect problem solving
reject the null hypothesis and conclude that losing one night sleep significantly affected problem solving
fail to reject the null hypothesis and conclude that losing one night sleep did not affect problem solving
fail to reject the null hypothesis and conclude that losing one night sleep significantly affected problem solving
f)
compute estimated cohen’s d to measure the size of the effect
estimated cohen’s d is
note: if it is a decimal number with two or more than two places, leave only two decimal places after the decimal point. do not round.
Answers: 3
Mathematics, 21.06.2019 20:20, oofoofoof1
Sample response: if the graph passes the horizontaline test, then the function is one to one. functions that are one to one have inverses that a therefore, the inverse is a hinction compare your response to the sample response above. what did you include in your explanation? a reference to the horizontal-line test d a statement that the function is one-to-one the conclusion that the inverse is a function done
Answers: 2
Aresearcher wanted to know whether losing one night sleep can affect problem solving. a sample of n...
English, 17.07.2019 02:00
Biology, 17.07.2019 02:00
Mathematics, 17.07.2019 02:00
Chemistry, 17.07.2019 02:00
Social Studies, 17.07.2019 02:00