Statistical Quiz Reviewer.docx

Statistical Quiz Reviewer 1. Statistics is concerned with the understanding of the nature and structure of data. Often, a data set collected, say from a telephone t elephone poll, is thought of as a portion of a lar ger aggregate of all units under study. This larger aggregate is known as: a.

Sample

b. population

c. statistic

d. parameter

2. Which of the following represent discrete data? a.

Temperature recorded every hour at the weather bureau

b. Lifetimes of television tubes produced by a company c.

Amount of money in a cash box

d. None of the above 3. A probability sampling method is any method of sampling that allows the calculation of each population unit’s likelihood of being selected into the sample. The selection is achieved through

some form of random selection. Which of the procedures below is not a form of random selection? a.

Picking a name out of a bow of names

b. Pulling out a short straw from a bunch of straw c.

Tossing a coin

d. Selecting the first 20 female students passing by a mall 4. On a survey of returning overseas F ilipino workers, educational attainment is coded as: 0=elementary level, 1=HS level, 2=college level. What leve l of measurement was used in describing educational attainment? a.

Nominal

b. Ordinal

c. Interval

d. Ratio

5. From knowledge of mean=82 and median=82, we would not expect the distribution to be a.

Rectangular

b. Skewed

c. Bimodal

d. Symmetrical

6. The 50th percentile is more commonly called the? a.

Mean

b. median

c. mode

7. In a frequency curve, the mean, median and mode are all located at one point. The distribution is said to be

a. Positively skewed

b. Negatively skewed

c. Symmetrical

8. Suppose the CHED develops a performance indicator system to assess the quality of education in all institutions of higher learning such that those institutions which garner a scor e below the 10th percentile will face drastic sanctions. Which of the following consequences would this policy ensure? a.

Not more than 10 schools will face drastic sanctions

b. 90 percent of the schools will fac e sanctions c.

Schools which get a rating 10 percent or lower will face drastic sanctions

d. Not more than 10 percent of the schools will face drastic sanctions 9. In how many ways can 5 differently colored mar bles be arranged in three rows? 60 ways 10. Five cards are drawn from a pack of 52 well shuffled cards. Find the probability that 4 are aces and 1 is a king. Express answer in simplest fraction.

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11. The standard deviation is very useful in describing the spread of a se t of observations. Which of t following statements is NOT a correct statement about the standard deviation of a population? a.

The greater the spread around the mean, the larger is the value of the standard deviation

b. It is possible for the standard deviation to be negative, as in the case when majority of

the observations are below the mean c.

The standard deviation is the square root of the arithmetic mean of the squared deviations from the average

d. The square of the standard deviation is called the v ariance 12. A study on the yield of crops applied with different amounts of fertilizer reveals that there is a positive relationship bet. Yield and amount of fertilizer. If we plot the number of observations made on these variables on a graph and divided the points in half with a horizontal line and then in half by a vertical line, where will we find more observations? a.

In the upper right and lower left quadrants

b. In the upper left and lower r ight quadrants c.

In the two upper quadrants

d. In the two lower quadrants 13. Before a presidential election is held, it is customary for opinion polls to be conducted throughout the country to determine the most likely victor. Suppose that one month before the next presidential election, 1200 respondents are randomly selected and asked their voting preference. The presidential candidate with the highest proportion of votes among the sampled respondents is then considered the most likely winner for the election. This method for drawing a conclusion regarding the total voting population from the sampled respondents is called: a.

Sampling design

b. Construction of confidence interval c.

Inductive interference

d. Deductive interference 14. Ruel is conducting a study on the correlation of a person’s height with his weight. He took a sample of male students from his university as subjects of his study. After analyzing the students height of male students is 5’2’’ while the median height is 5’7”. The distribution of the height of male students in his university is most likely a.

Symmetrical

b. negatively skewed

c. positively skewed

d. uncertain

15. We asked five people how many hours of television they watch in a week. We obtained the data: 3 5 8 8 50 . In this situation, what would be the most appropriate statistic to describe the typical TV viewing time per wee k? a.

Mean

b. median

c. mode

d. none

16. When the variance of a set of values is zero a.

The population has a symmetric distribution

b. The mean is zero c.

The values are very small

d. The values are all equal

17. It is a process by which one makes generalizations about a population bed on data obtained from a sample? a. b. c.

Hypothesis testing

Statistical interference Descriptive statistic

d. None of the above 18. The basic monthly salary of 15 operators in a telephone company is 9500 each. If the total monthly salaries paid to female operators is 114000. Determine the percentage of male operators employed in the company? 20% 19. If an insurance company quotes odds of 3 to 1 for the event that an individual 70 years of age will survive another 10 years, what is the probability assgned to this event? 3/(3+1)=3/4 20. Ann got a score of 45which is equivalent to a 60 th percentile rank in a math test. Which of the following is not true? a.

ann scored above 60% of her classmates

b. 40% of the class got scores of 45 and above c.

If the passing mark is the lower quantile, ann passed the test

d.

Ann’s score is below the 5

th

 decile