Question

An experiment on memory was performed, in which 16 subjects were randomly assigned to one of...

An experiment on memory was performed, in which 16 subjects were randomly assigned to one of two groups, called "Sentences" or "Intentional". Each subject was given a list of 50 words. Subjects in the "Sentences" group were told to form multiple sentences, each using at least two words from the list, and to keep forming sentences until all the words were used at least once. Subjects in the "Intentional" group were told to spend five minutes memorizing as many of the 50 words as possible. Subjects from both groups were then asked to write down as many words from their lists as they could recall. The data are in the table below.

Number of words recalled
"Sentences" group 31 27 33 29 31 33 30 28
"Intentional" group 32 32 30 30 32 28 36 32


Enter this data into JMP in "long form" (e.g. each column should be a variable and each row should be an observation).
IMPORTANT: to format this data correctly, you need to think about what your two variables are (they are not 'Sentences' and 'Intentional'). You may want to look at how the deflategate data are formatted if you have trouble figuring this out.

We are interested in determining if there is a significant difference in the average number of words recalled for subjects in the "sentences" group vs. subjects in the "intentional" group, using α = 0.05. Use JMP to answer the questions below, and round all answers to three decimal places.

a. The appropriate null/alternative hypothesis pair for this study is:
(you have two attempts at this question)

H0: μd = 0 ; HA: μd ≠ 0H0: μsentences - μintentional = 0 ; HA: μsentences - μintentional > 0    Ho: μsentences - μintentional = 0 ; HA: μsentences - μintentional < 0H0: μsentences - μintentional = 0 ; HA: μsentences - μintentional ≠ 0H0: μd = 0 ; HA: μd > 0H0: μd = 0 ; HA: μd < 0



b. Enter the values for the following statistics:

xsentences =  
ssentences =  
xintentional =  
sintentional =  
(xsentences - xintentional) =  
standard error of (xsentences - xintentional) =  (you have to use 'Analyze / Fit Y by X' to get JMP to calculate this)
test statistic: t =  
p-value =  

c. Report the 95% confidence interval JMP gives for μsentences - μintentional

Lower bound =  
Upper bound =  

d. From these results, our statistical conclusion should be:
(You have two attempts at this question.)

The means for "sentences" and "intentional" differ significantly, because the p-value is less than α and zero is inside the confidence interval

The means for "sentences" and "intentional" differ significantly, because the p-value is less than α and zero is outside the confidence interval  

  The means for "sentences" and "intentional" differ significantly, because the p-value is less than α and -1.25 is inside the confidence interval

The means for "sentences" and "intentional" differ significantly, because the p-value is less than α and -1.25 is outside the confidence interval

The means for "sentences" and "intentional" do not differ significantly, because the p-value is greater than α and zero is inside the confidence interval

The means for "sentences" and "intentional" do not differ significantly, because the p-value is greater than α and zero is outside the confidence interval

The means for "sentences" and "intentional" do not differ significantly, because the p-value is greater than α and -1.25 is inside the confidence interval

The means for "sentences" and "intentional" do not differ significantly, because the p-value is greater than α and -1.25 is outside the confidence interval

Homework Answers

Answer #1

(d) The means for "sentences" and "intentional" do not differ significantly, because the p-value is greater than α and zero is inside the confidence interval.

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