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Lab Worksheet: independent samples t-test . Identify the proper variables and hypotheses for the following research question: Is there a difference in the number of digits recalled between auditory and visual presentation of the digit span task? 2 point:s a. What is the IV and its corresponding levels conditions? i. Condition: 1. Auditory 2. Visual b. What is the DV as operationally defined (measured)? i. Digits Recalled ii. Time To Complete State the null hypothesis: Ho: A d. State the alternative hypothesis: Ha: c. 2. Conduct an independent samples t test on the data and report your findings: 4 points a. Can homogeneity of variance be assumed? i YINHox do you know? What is the mean difference between the groups? b. i. Digits Recalled: -0.690 Time To Complete: 48.593 ii. c. What is.the appropriate degrees of freedom? i. 56 d. What is your computed (obtained) t-value from JASP? i. Digits Recalled: -1.701 ii. Time to Complete:-1.423 e. What is the p-value in JASP)?e. What is the p-value in JASP)? i. Digits Recalled p-value: 0.094 Time To Complete p-value: 0.160 ii. f Compare the p-value to a 05 Is the p-value higher or lower? i. Digits Recalled: α-A5 < 0.094; the p-value is higher. Time to Complete: α-A5 < 0.160; the p-value is higher. ii. Should you accept or reject the null hypothesis, and why? Paste a plot of the means below. g. h. Results Independent Samples T-Test Independent Samples T-Test R Mean Difference SE Difference DigitsRecalled 1.701 56.00 0.094 Tinsto Complets 1423 56.00 0.160 Note. Students t-test. 0.690 -48.593 34.138 Assumption Checks Test of Equality of Variances (Levenes) F d R 1.109 1 0297 3280 1 0076 Time to ComoleteTest of Equality of Variances evene s) F dt R 1.109 1 0297 DigitsRccalled Tict Complets3280 0.076 Descriptives Group Descriptivss DisitsRecalled Auditory 29 6.103 1448 Group N Mean SD SE Visua 29 6.793 1.634 0.303 Visua 29 469.826 150.660 27.977 0.269 Descriptives Plots DigitsRecalled 7.5 5.5 Auditory Visual Condition550- 350 Auditory Visual Condition 3. Follow the instructions found at the following website to write a full APA-formatted results paragraph for your t-test analysis. 4 points http:l/statistics-helo-for students. m How do I report independent samples T test data in APA steht #NCTz? UrLct

math   Statistics-And-Probability   
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Answer #1


Here there are two variables which are number of digits recalled between auditory and visual presentation of the digit span task and time to complete.


Independent variables : Auditory and visual.
Dependent variable : Digits recalled and time to complete.


The null hypothesis is,
H0 : mu = 0 Vs H1 : mu not= 0
Where mu is population mean.


Assume alpha = level of significance = 0.05


Here not need of testing the variances because we consider two dependent variables independently.


We use F-test for variances when two groups are are given.


We have given the output of the independent sample t-test of two variables.


Mean difference (digits recalled) = -0.690

Mean difference (Time to complete) = -48.593
Degrees of freedoms for both variables = n1+n2-2 = 56
Test statistic (Digits recalled)= -1.701
Test statistic (Time to complete) = -1.423
P-value (Digits recalled) = 0.094
P-value (Time to complete) = 0.160
P-value < alpha (For digits recalled)
Reject H0 at 5% level of significance.
We get significant result.
P-value > alpha (For time to complete)
Accept H0 at 5% level of significance.
We get insignificant result.

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