Can someone please help me with these?

1.)The scores of a random sample of 8 students on a physics test are as follows: 60,62,67,69,70,72,75 and 78.

a.What is the null and alternative hypothesis?

b.Test to see if the sample mean is significantly different from 65 at the .05 level. give a results section.

c.The researcher realizes that she accidentally recorded the score that should have been 76 as 67. Are these corrected scores significantly different from 65 at the .05 level? give as a results section.

2) A hypothetical experiment is conducted on the effect of alcohol on perpetual motor ability. Ten subjects are tested in each condition, having two drinks and after having two glasses of water. The scores of the 20 subjects are shown below. The first number for each subject is their performance in the "water" condition. Higher scores reflect better performance. Test to see if alcohol had a significant effect.

a.What is the null and alternative hypothesis?

b.Write the results for the descriptive statistics and create table

c.Report the 95% confidence intervals and test Cohen's d(calculated by hand), interpret the results from the effect size.

Wateralcohol

1613

1513

1110

2018

1917

1411

1310

1515

1411

1616