Do Canadian children whose parents are librariansscore higher the Canadian children in general on reading ability? 2-is the level of income for residents of a particular city different from the level of income for people in the region?

For each of the following, (a) say which populations are being compared,(b) state the research Hypothesis,(c)state the null hypothesis,(d) say whether you should use a one or two tail test and why

1-Do Canadian children whose parents are librariansscore higher the Canadian children in general on reading ability?

2-is the level of income for residents of a particular city different from the level of income for people in the region?

 

3-Do people who have experience and earthquake have more or less self-confidence then the general population?

 

For each of the following samples that were given an experimental treatment,

test whether they are different from the general population: (a) a sample of 10

with a mean of 44, (b) a sample of 1 with a mean of 48. The general population

of individuals has a mean of 40, a standard deviation of 6, and follows a normal

curve. For each sample, carry out a Z test using the five steps of hypothesis testing

with a two-tailed test at the .05 significance level, and make a drawing of the

distributions involved. (c) ADVANCED TOPIC: Figure the 95% confidence

interval for parts (a) and (b).

 

 

In each of the following studies, a single sample’s mean is being compared to a

population with a known mean but an unknown variance. For each study, decide

whether the result is significant. (Be sure to show all of your calculations.)`

Practice Problems

Estimated

Sample Population Population Sample Significance Level

Size (N ) Mean ( ) Variance ( ) Mean (M) Tails ( )

(a) 64 12.40 9.00 11.00 1 (low predicted) .05

(b) 49 1,006.35 317.91 1,009.72 2 .01

(c) 400 52.00 7.02 52.41 1 (high predicted) .01

 

 

 

1) For each of the following studies, say whether you would use a t test for dependent means or a t test for independent means.

a) A researcher randomly assigns a group of 25 unemployed workers to receive a new job skills program and 24 other workers to received the standard  job skills program, and then measures how well they all do on a job-skills test.

b)A researcher measures self-esteem in 21 students before and after taking a difficult exam

c)A researcher tests reaction time of each of a group of 14 individuals twice, once while in a very hot room and once while in a normal-temperature room.