A researcher is comparing the effectiveness of two sets of instructions for assembling a child's bike. Two groups of parents assemble a bike using either instruction set 1 or 2. Is there a significant difference in minutes it took to assemble the bike for the two sets of instructions? ( = .05) SHOW YOUR WORK

1. Use the tables below to conduct an independent samples t-test by hand.

Instructions 1	Time it took (X1)	X1 M1	(X1 M1)2
A	9
B	7
C	12
D	10
E	7
F	3
df1= ______	M1 = _______		SS1 = ______
Instructions 2	Time it took (X2)	X2 - M2	(X2 M2)2
A	14
B	8
C	9
D	16
E	15
F	7
G	15
df2 = ______	M2 = _______		SS2 = _____

a. Pooled variance s²_p= __________

b. Estimated standard error s_{(m1 - m2)}= ________

c. t_obs = ________

d. t_crit= ____________________

e. Reject / Fail to reject the null hypothesis? ____________________

2. A personality researcher believes that social media use is associated with extraversion. They recruited 6 participants for a pilot study to take a social media use and an extraversion question inventory, both out of 10 points. The scores below are the number of points participants scored on each measure (X = Extraversion; Y = Social Media Use). Can the researcher conclude that the two variables are significantly related? ( = .05)

Participant	X	Y	X-Mx	(X-Mx)2	Y-MY	(Y-MY)2	(X-Mx)(Y-MY)
A	6	7
B	7	9
C	2	3
D	4	2
E	5	7
F	4	7

df =

Mx =

My =

SSx = _____________

SSy = _____________

SP = _________________

r = __________

1. Reject or fail to reject the null? ________________________

2. Were the variables significantly related?

3. Based on the correlational results, are you able to say that one's extraversion level causes their social media use? Why or why not?