How did you get initiated your freshman year?

bicycle helmets hats image

Melissa

I didn't get initiated..I was friends with upper class-man.

Answer
All the freshmen at my high school were given really horrible looking hats they had to wear everyday for a week at school. Each freshmen had a senior sister (I went to an all girls high school). Thank GOD my Senior sister was nice. She made me probably the best looking hat of all of them. One girl had to wear a bicycle helmet with burnt popcorn glued all over the top LOL!! IT WAS HILARIOUS. That helmet stunk though haha.

could someone please answer the following stat's question?

Mary

There has been debate about the effectiveness of bicycle helmets in preventing head
injuries to bicyclists involved in accidents. In a group of 22 accidents where the
bicyclist suffered injuries, of the sixteen who were wearing a helmet three suffered
head injuries whilst of the six who were not wearing a helmet two suffered head
injuries. Determine if there is a difference in the incidence in head injuries between
those bicyclists who do and do not wear a helmet.

Answer
Let P1 be the proportion of those wearing a helmet that suffered head injuries
Let P2 be the proportion of those not wearing a helmet that suffered head injuries

H0: P1 = P2
Ha : P1 â  P2

p1-hat = 3/16
p2-hat = 2/6

Sample 1 proportion x1/n1 = 0.1875
Sample 2 proportion x2/n2 = 0.3333
Pooled proportion pi= (3+2)/(16+6) = 0.2273

Variance of difference in proportions = pi*(1-pi)*(1/n1+1/n2)
= (0.227273)(0.772727)(1/16+1/6) =0.0402462

Standard error of (p1hat-p2hat) = 0.200615

z = (p1hat-p2hat) / sqrt[pi*(1-pi)*(1/n1+1/n2)]
z = -0.145833 / 0.200615 = -0.726933

P( |z| > 0.726933) = (0.2327)(2) = 0.4654
P-value = 0.4654

Assume the significance level is 0.05
Since P-value > significance level, we do not reject the null hypothesis.

There is no evidence of a difference between the two groups.

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