1. In using the Binomial, we are dealing with data that can only assume certain values, and there are usually "gaps: between the values. This type of data is called:
a. discrete
b. mutually exclusive
c. continuous
d. exhaustive
e. none of the above
2. the area of statistics which deals with estimating a population parameter based on a sample statistic is called:
a measurement analysis
b. descriptive stat
c. dispersion analysis
d. inferential stat
e. none of the above
3. which of the following most resembles a bar graph, in appearance?
a. frequency polygon
b. less-than-cumulative frequency distribution
c. greater-than cumulative frequency distribution
d. histogram
e. none of the above
4. if all of the values of a distribution are summed and the sum is divided by the number of values, the result is the:
a. variance
b. standard deviation
c. arithmetic mean
d. median
e. none of the above
5. Based on the empirical rule, what percent of the observations will lie below the point which is two standard deviation below the mean?
a. 95 percent
b. 5 percent
c. 68 percent
d. 2.5 percent
e. 32 percent
6. an example of the relative frequency concept of probability is:
a. playing a hunch that the horse gum will win the Kentucky derby
b. drawing a face card at random from a standard deck of playing cards
c. noting that 45 insurance policies were sold out of the 200 contacts that were make
d. noting that there is a 60% chance of rain tomorrow
e. none of the above
7. if P(A)=0.35, P(B)-0.45, and the P(A and B)=0.20, what does P(A or B) equal?
a. 0.60
b. 1.00
c. 0.40
d. 0.80
e. none of the above
8. if P(D)=0.20 and P(C l D)=0.50, what does P(C and D) equal?
a. 0.70
b. 0.10
c. 0.30
d. 0.40
e. none
9. if one can choose any six of 40 numbers, in any order, to play a state lottery game, how many different arrangements are possible?
a. 2,763,633,600
b. 2,763,600
c. 3,838,380
d. 240
e. none
10. which of the following statements about the central Limit theorem is incorrect?
a. the mean of the sampling distribution will be approx equal to the population mean, with that approx getting better as sample size increases.
b. the variance of the sampling distribution of the means is equal to 2/n, assuming that the sample size is sufficiently large
c. the sampling distribution of all possible sample sizes of size n generated from the population will be approx normally distributed
d. all of the above is incorrect
11. a stats student received a grade of 85 on a stats midterm. if the corresponding z score equaled +1.50, and the standard deviation equaled 7, what was the average grade on this exam?
a. 95.5
b. 74.5
c. 78.0
d. cannot determine without knowing how many look the exam
e. none of the above
12. if the level of confidence is decreased from 95 percent to 90 percent, but the allowable error and standard deviation remain the same, the required sample size will be:
a. increased
b. decreased
c. unchanged
d. none of the above
13. the mean number of travel days per year for the outside salespeople employed by hardware distributors is to be estimated. the .90 degree of confidence is to be used. the mean of a small pilot study was 150 days, with a standard deviation of 14 days. if the population mean is to estimated within 2 days, how many outside salespeople should be sampled?
a. about 133
b. about 452
c. about 511
d. about 2100
e. none of the above
14. at the .05 level, z=1.645 and t=1.860, this indicates that for small sample sizes:
a. a larger computed value will be needed to reject the "null" hypothesis.
b. the region of acceptance will be wider than for large samples
c. the confidence interval will be wider than for large samples
d. all the above
15. the appropriate use of the t-distribution for hypothesis testing assumes that the
a. population is near to normal in shape
b. population standard deviation is known
c. population is positively skewed
d. population standard deviation is unknown
e. both "a" and "d" are correct
16. using two independent samples, two population means are compared to determine if a difference exists. the number in the first sample is 15 and the number in the second sample is 12. How many degrees of freedom are associated with the critical t-value?
a. 26
b. 27
c. 25
d. cannot determine from the information given
e. none of the above

    • 5 years ago
    Answers only ...
    NOT RATED

    Purchase the answer to view it

    blurred-text
    • attachment
      InusingtheBinomialwearedealingwithdata.doc