Inference In Practice A Population Mean And Confidence Intervals All work and explanations requiredInference in practice; Inference about a Population Mean

Inference In Practice A Population Mean And Confidence Intervals All work and explanations requiredInference in practice; Inference about a Population Mean; confidence intervals; The one-sample t confidence interval True/False
1.
If you were doing a two-tailed test of significance, you would need to divide the ? by two, in order to
determine the critical region.
2.
In order to determine the y-intercept in a regression problem, both the dependent variable and the
independent variable must be quantitative.
3.
In a random sample of 48 observations from a normal distribution, there will be approximately 12
observations less than the 25th percentile.
4.
In a one-tailed test where n=21, the value of the Z-test statistic equals -1.812. If ? were set at 0.01,
this test would be considered significant
5.
If a person had a z-score of 0.50, then their actual raw score has to be above the median.
6.
If a statistical test is significant at the 10% (alpha = 0.10) level, then it may or may not be significant
at the 5% (alpha = 0.05) level.
7.
A correlation coefficient estimated to be close to +1.0 , would be considered to be a very strong
linear relationship.
8.
If a 99% CI for the population mean age is calculated to be [36yrs, 46yrs]; then this implies that
approximately 1% of the population will be older than 46 years old.
9.
A test of H0 : ? = 50 against H1 : ? -1.45) =
b) What is the P ( -.81 – 2.093 ) =
a) What is the P ( t