Q1 Which of the following statements is NOT correct?

(I)The median is a measure of central tendency.

(II)The range is a measure of spread.

(III) For a symmetric distribution, the mean is equal to the median.

(IV)For a skewed distribution, the variance is a negative number.

(V)Mode is affected by outliers.

a.I and IV

b.IV and V

c.IV only

d.I, II and III

Q2 The purpose of hypothesis testing is to:

a.

test how far the mean of a sample is from zero.

b.

determine whether a statistical result is significant.

c.

determine the appropriate value of the significance level.

d.

determine the appropriate value of the null hypothesis.

Q3 If the F test statistic for a multiple regression is greater than the critical value from the F distribution, it implies that:

a.none of the independent variables in the regression model have a significant effect on the dependent variable.

b.all of the independent variables in the regression model have significant effects on the dependent variable.

c.one or more of the independent variables in the regression model have a significant effect on the dependent variable.

d.None of the above is correct.

Q4 An example of a metric variable is:

a.

month of birthday

b.

time taken to coplete a special reasoning task

c.

highest educational degree earned

d.

telephone area code

Q5 A particular species of fish is being farmed. At six month old, their lengths are found to be normally distributed with a mean of 50 mm and a standard deviation of 2 mm. Using the 68-95-99.7 rule, determine which fish with the following length is UNLIKELY to be chosen at random.

a.

49 mm

b.

44mm

c.

52mm

d.

53mm

Q6 A survey will be given to 200 students randomly selected from the postgraduate programs at University A. 50 students have responded to the survey. What is the population?

a.The 100 randomly selected students.

b.All students at University A.

c.All postgraduate students at University A.

d.The 50 students who responded to the survey

Q7 In what sampling method does the researcher determine the sampling interval, select a random starting point between 1 and k, and then select every kth element?

a.Stratified random sampling

b.Systematic random sampling

c.Cluster sampling

d.Convenience sampling

Q8 If mean=60, mode=50 and standard deviation=5, the distribution is:

a.

Positively skewed

b.

Negatively skewed.

c.

Symmetrical

d.

Difficult to tell

Q9 Which is NOT true for the mean of a sampling distribution?

a.It is the mean for all of the samples in the distribution.

b.It depends on the sample size.

c.It is the same as the population parameter.

d.None of the above

Q10 Focusing on describing or explaining data versus going beyond immediate data and making inferences is the difference between _______.

a.

Parameter and statistic

b.

Statistical tool and test statistics

c.

Metric and categorical variable

d.

Population and sample

Q11 What does the coefficient of multiple determination (R2) measure?

a.It measures the variation around the predicted regression equation.

b.It measures the proportion of variation in the dependent variable explained by independent variables.

c.It will have the same sign as the estimated slope b1.

d.It measures the proportion of variation in Y that is explained by X1 holding X2 constant

Q12 If the correlation coefficient of a dependent and independent variable is a positive value, then the slope of the regression line of the same variables:

a.must also be positive

b.can be either negative or positive

c.can be zero

d.cannot be zero

Q13Which of the following statement is correct?

a.

In a right-skewed distribution, the mean is lower than the median

b.

For a skewed distribution, the standard deviation is a negative number.

c.

In a left-skewed distribution, the skewness is a negative number, while in a symmetric distribution, the skewness is a positive number.

d.

None of the above

Q14 A survey will be given to 200 students randomly selected from the postgraduate programs at University A. 50 students have responded to the survey. What is the population?

a.

The 100 randomly selected students.

b.

All students at University A.

c.

All postgraduate students at University A.

d.

The 50 students who responded to the survey.

Q15 If two variables are highly and positively correlated, you can conclude:

a.

that they always go together

b.

that high values on one variable lead to high values on the other variable

c.

that there are no other variables responsible for the relationship

d.

that changes in one variable are accompanied by predictable changes in the other

Q16 The intercept in linear regression represents:

a.

the strength of the relationship between x and y.

b.

the expected x value when y is zero.

c.

the expected y value when x is zero.

d.

a population parameter.

Q17 Which one is the feature of regression analysis?

a.

Regression enables prediction of the dependent variable

b.

Regression estimates the line of best fit through the data

c.

Regression provides measures of association in units of the variable being measured

d.

All of the above