Which of the following is most likely a population

Which of the following is most likely a population

Subject: Mathematics / Statistics
Question
Question 1

Which of the following is most likely a population as opposed to a sample?
respondents to a newspaper survey
the first 5 students completing an assignment
every third person to arrive at the bank
registered voters in a county

4 points

Question 2

Which of the following can be reduced by proper interviewer training
sampling error
measurement error
both of the above
none of the above

4 points

Question 3

According to the empirical rule, if the data form a “bell-shaped” normal distribution, ________ percent of the observation will be contained within 1 (one) standard deviation around the arithmetic mean.
68.26
75.00
88.89
93.75

4 points

Question 4

The probability that a new advertising campaign will increase sales is asssessed as being 0.80. The probabliity that the cost of devolping the new add campaign can be kept within the original budget allocation is 0.40. Assuming that the two events are independent, the probability that the cost is kept withing budget and the campain will increase sales is:
0.20
0.32
0.40
0.88

4 points

Question 5

In a non symmmetrical distribution:
the range equals the interquartile range
the interquartile range equals the mean
the median does not equal the mean
the variance equals the standard deviation

4 points

Question 6

Which statement about the standard normal distribution is NOT true
It has a mean of 0
It has a variance of 0
has an area under the probability distribution curve equal to 1.
has a standard deviation of 1.

4 points

Question 7

If we know that the length of time it takes a college student to find a parking spot in the library parking lot follows a normal distribution with a mean of 4.5 minutes and a standard deviation of 3.2 minute, find the probability that a randomly selected college student will find a parking spot in the library parking lot in less than 4 minutes.
0.4379
0.5000
0.5620
0.9999

4 points

Question 8

The following data represent the response (Y for yes and N for no) from a sample of 40 college students to the question SDo you currently own shares in any stocks? (8 points)N N Y N N N N Y N Y N N Y N Y Y N N N YN Y N N N N Y N N N Y N N N Y N N Y N NWhat is the standard error of the sample proportion of college students who own stocks?
0.0114
0.0724
0.4582
2.8982

4 points

Question 9

If an economist wishes to determine whether there is evidence that average family income in a community exceeds $25,000
either a one-tailed or two-tailed test could be used with equivalint results.
a one tailed test should be utilized.
a two-tailed test shoud be utilized.
none of the above.

4 points

Question 10

The power of a statistical test is
the probability of not rejecting Ho when it is false.
the probability of rejecting Ho when it is true.
the probablility of not rejecting Ho when it is true.
the proability of rejecting Ho when it is false.

4 points

Question 11

If we are testing for the difference between the means of 2 related populations with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to
39
38
19
18

4 points

Question 12

The statictical distribution used for testing the difference between two population variances is the ___ distribution.
t
standardized normal
binomial
F

4 points

Question 13

a “robust” test procedure is one which
requires a sofphisticaed level of measurement.
requires a semi-circular shaped population.
is sensetive to slight violations in its assumptions.
is insensetive to slight violations in its assumptions.

4 points

Question 14

Why would you use the Tukey-Kramer procedure?
to test for normality
to test for homogeneity of variance
to test for independence of errors
to test for the differences in pairwise means

4 points

Question 15

For a given level of significance, if the sample size is increased, the power of the test will
increase
stay the same
decrease

4 points

Question 16

The standard error of the sample proportion is the largest when the sample proportion reaches
0.9
0.8
1
0.5

4 points

Question 17

An economist is interested in studying the incomes of consumers in a particular region. The population standard deviation is know to be $1,000. A random sample of 50 individuals resulted in an average income of $15,000. What sample size would the economist need to use if he wants a 95% confidence interval no wider than plus or minus $100?
1486 individuals
385 individuals
126 individuals
85 individuals

4 points

Question 18

A 99% confidence intereval estimate can be interpreted to mean that
if all possible samples are taken and confidence interval estimates are developed, 99% of them would include the true population mean somewhere within their interval.
we have 99% confidence that we have selected a sample whose interval does include the population mean.
both of the above
none of the above

4 points

Question 19

The Y intercept (bo) represnts the
the predicted value of Y when X = 0.
the change in estimated average y per unit change in X.
predicted value of Y.
variation around the sample regression line.

4 points

Question 20

The slope (b1) represents
the predictied value of Y when X = 0
the estimated average change in Y per unit change in X.
the predicted value of Y.
variation around the line of regression.

4 points

Question 21

The least squares method minimizes which of the following?
SSR
SSE
SST
all the above

4 points

Question 22

In performing a regression analysis involving two numerical variables, we are ssuming:
the variances of X and Y are equal.
the variation around the line of regression is the same for each X value.
that X and Y are independent.
all of the above.

4 points

Question 23

The strength of the linear relationship between to numerical variables may be measured by the
scatter diagram
coefficient of correlation
slope
Y intercept

4 points

Question 24

In a multiple regression mode, the value of the coefficient of multiple determination
has to fall between -1 and +1.
has to fall between 0 and +1.
has to fall between -1 and 0.
can falll between any pair of real numbers.

4 points

Question 25

When testing for independence in a contingency table with 3 rows and 4 columns, there are ______ degrees of freedom.
5
6
7
12