Statistics Assignment | Custom Assignment Help
1.“A recent survey and analysis conclude that 80 percent of all pre-school children enjoy eating ice cream.” The
the statement is an example of:
- Descriptive Statistics
- Statistical Significance
- Inferential Statistics
- Standard Score
2.The null hypothesis of “average GPA of Rutgers students is equal to 3.2” is to be tested at a significant level of 0.05. A sample of 25 students resulted in a computed t of 1.67. The decision is to
- average GPA of students is 3.2
- average GPA of students is more than 3.2
- average GPA of students is less than 3.2
- none of the above
3.A study claims that the proportion of adults in the U.S. with rudimentary literary skills is 21%. A researcher believes the true percentage differs from this one that is published (Source: U.S. Department of Education). Which of the following demonstrates a Type I error?
- Not rejecting H0: p = 0.21, when actually p = 0.21.
- Rejecting H0: p = 0.21, when actually p = 0.21.
- Rejecting H0: p = 0.21, when actually p is not equal to 0.21.
- Not rejecting H0: p = 0.21, when actually p is not equal to 0.21.
4.The correlation coefficient r was computed to be -0.80. This indicates that
- there is almost no relationship between the two variables
- 80 percent of the variation in the independent variable is accounted for by the variation in the dependent variable.
- the coefficient of determination is -0.20.
- none of the above
5.The slope of a regression equationn? is 10, the value where the line intersects the Y axis when X = 0 is 4. What is the regression equation
- X = 0 + 10Y
- Y = 10- 4X
- Y = 4 + 10X
- Y = 4- 10X
- none of the above
6.Director of a company wants to know the mean salary of the company’s employees. The most effective way to determining this is to
- Record the salaries of a simple random sample of employees
- Record the salaries of a stratified random sample of employees
- Record the salaries of a cluster random sample of employees
- Record the salaries of a convenience sample of employees
- Consult computer records regarding the salaries of all employees.
