Question

1. Which of the following statements is correct in questionnaire design?

a) The questionnaire and questions should be kept as short as possible.

b) A mixture of dichotomous, multiple-choice, and open-ended questions may be used.

c) Leading questions must be avoided.

d) All of the above are correct statements

e) None of these

2. In a histogram, the proportion of the total area, which must be to the left of the median, is:

a) exactly 0.50

b) less than 0.50 if the distribution is skewed to the left

c) more than 0.50 if the distribution is skewed to the right

d) between 0.25 and 0.60 if the distribution is symmetric and unimodal

e) none of these

3. Possible methods of creating distorted impressions with bar charts include:

a) Stretching the vertical axis.

b) Shrinking the horizontal axis

c) Constructing the bars so that their widths are proportional to their heights.

d) All of the above

e) None of these

4. Which of the following statements about the arithmetic mean is not always correct?

a) The sum of the deviations from the mean is zero

b) Half of the observations are on either side of the mean

c) The mean is a measure of the middle (center) of a distribution

d) The value of the mean times the number of observations equals the sum of all of the observations.

e) None of these

Answer 1

1. (c) All the above answers are correct is the correct question

because in questionnarie method question should be short otherwise there is highchance to skip that question

question should be multiple choice type because the persons not have enough time to answer writing an essay type answer and leading questions should be avoided otherwise the personal of persons maybe hurted .

2. (a) is correct because in histogram we think the left of the histogram is covered half of the total area it is the defination ofmedian

4.(c) is correct because if mean is middle center of a distribution then mean = median that is only symmetric distribution but itis not always true the a.m. is only good measure for symmetric distribution.