Question
1. ) Class sizes were noted for a random sample of classes at 3 levels for a large school district. At =0.01, can it be
1. ) Class sizes were noted for a random sample of classes at 3 levels for a large school district. At =0.01, can it be concluded that there is a difference in the mean class size at the three different levels? If a difference exists, test each pair of means to locate the difference.
Elementary | Middle School | Secondary School |
30 | 24 | 20 |
28 | 27 | 18 |
25 | 30 | 24 |
26 | 25 | 20 |
28 | 26 | 23 |
32 | 28 | 24 |
24 | 24 | |
29 |
2.) A recent survey asked adults nationwide if they thought that the federal government should continue to fund Nasa's efforts to send unstaffed missions to Mars. 56% said they should continue, 40% said they should not continue, and 4% had no opinion. A random sample of 200 college students resulted in these numbers:
Should continue: 126
Should not continue: 65
No opinion: 9
Is there sufficient evidence at @(alfa)=0.05 to conclude that the opinions of the college students differ from those of the report?
2. ) Are health and happiness related? The following data represents the level of happiness and level of health for a random sample of individuals from a General Social Survey.
Health | |||||
Excellent | Good | Fair | Poor | ||
Happiness | Very Happy | 271 | 261 | 82 | 20 |
Pretty Happy | 247 | 567 | 231 | 53 | |
Not too Happy | 33 | 103 | 92 | 36 |
Can you conclude that health and happiness are related? Use @(alfa)=0.05
4.) The times required by 3 workers to perform an assembly -line task were recorded on five randomly selected occasions. Here are the times, to the nearest minute.
Hank | Susan | Joseph |
8 | 8 | 10 |
10 | 9 | 9 |
9 | 9 | 10 |
11 | 8 | 11 |
10 | 10 | 9 |
Are the three means equal for @(alfa)=0.05 ?
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started