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## Statistics Homework Question And Solution Course Code: EDUC 7030

Course Title: Educational Statistics

Instructions: For computations, show all work and circle final answers. Not showing work is subject to point reduction.

1. The null hypothesis is the hypothesis that

1. there is no difference
2. there is a difference
3. there may be a difference
4. none of the above

A survey researcher hypothesized the mean income in Memphis as \$42,000. The population mean income in Memphis is, in fact, \$42,000, but the survey researcher rejects the hypothesis.

2. What type of error did this survey researcher make?

1. Type I error
2. Type II error
3. Sampling error
4. none of the above

3. Statistical estimation refers to

1. inferring from the sample statistics to the population parameter
2. deducting from the sample statistics to the population parameter
3. inferring from the population parameter to the sample statistics
4. deducting from the population parameter to the sample statistics

4. The smaller the standard error of the mean,

1. the smaller the degree of freedom
2. the wider the confidence interval
3. the closer the sample mean is zero
4. the greater the statistical precision

5. If the level of significance is .01, the chance of making a Type I error is

1. 99%
2. 90%
3. 10%
4. 1%

6.  When other conditions are held constant,

1. the .95 CI is wider than the .99 CI
2. the .99 CI is 1 ½ time wider than the .95 CI
3. the .95 CI fits within the .99 CI
4. the .95 CI is .95 is the same as the .99 CI