A plastic surgeon thinks he has made more money on average p…

A plastic surgeon thinks he has made more money on average per month in the second half of the year than the first half of the year.  Test at the .05 level of significance whether the average per month in the second half is greater than the average per month in the first half. First 6 Months Second 6 Months s1=49.4 s2=86.29 n1=6 n2=6

A plastic surgeon is looking to update his website. A new co…

A plastic surgeon is looking to update his website. A new company is claiming he should invest with them, because they have less variability than the typical plastic surgeon in terms of website traffic by day.   The typical plastic surgeon has swings in the daily standard deviation of their website traffic of 135 clicks per day.  The new company claims that based on a sample of 12 other companies they’ve worked with, they have a standard deviation of 99 clicks.    a) At the 5% significance level, test whether their clicks are in fact below the national standard deviation level of 135. b) Create a 95% confidence interval for the daily clicks based on the sample of 12 companies.  

There are four students running for student government. Belo…

There are four students running for student government. Below are the counts of votes each candidate received.  At the 5% significance level, do the data provide sufficient evidence to conclude that a difference exists in the mean number of votes among the four candidates?   Please complete an anova table.   Class Year Brett Leon Eric Ishan Freshman 95 51 58 48 Sophomores 49 50 40 16 Juniors 88 76 12 37 Seniors 96 84 10 75 Sample Standard Deviations                22.3             17.3             23.2             24.6 x-bar                77.3             59.0             36.7             33.7 n: 4 4 4 4

There are four students running for student government. Belo…

There are four students running for student government. Below are the counts of votes each candidate received.  At the 5% significance level, do the data provide sufficient evidence to conclude that a difference exists in the mean number of votes among the four candidates?   Please complete an anova table.   Class Year Brett Leon Eric Ishan Freshman 95 51 58 48 Sophomores 49 50 40 16 Juniors 88 76 12 37 Seniors 96 84 10 75 Sample Standard Deviations                22.3             17.3             23.2             24.6 x-bar                77.3             59.0             36.7             33.7 n: 4 4 4 4