首頁 > 線上測驗 > 102(101)年研究所統計學歷屆試題(企管所、商研所)(二年期)-XO > 101年國立彰化師範大學企業管理所, 行銷與流通管理所統計學
If X and Y are any random variables with E(X ) = 5 , E(Y) = 6 , E(XY) = 21 ,
V (X ) = 9 and V (Y) = 10 , then the relationship between X and Y is a:
strong positive relationship.
strong negative relationship.
weak positive relationship.
weak negative relationship.
When extreme values are present in a set of data, which of the following descriptive
summary measures are most appropriate?
Coefficient of variation and range
Mean and standard deviation
Interquartile range and median
Variance and interquartile range
If the standard error of estimate se = 20 and n = 10 , then the sum of squares for
error, SSE, is:
400
3200
4000
40000
The standardized residual is defined as:
residual divided by the standard error of estimate.
residual multiplied by the square root of the standard error of estimate.
residual divided by the square of the standard error of estimate.
residual multiplied by the standard error of estimate.
first-order model with two predictor variables with no interaction.
first-order model with two predictor variables with interaction.
second-order model with three predictor variables with no interaction.
second-order model with three predictor variables with interaction.
The sign test statistic is approximately normally distributed whenever the sample sizes
are larger than:
5
10
30
None of these choices.
Which of the following tests employs matched-pairs sampling?
The Wilcoxon signed-rank sum test
The Wilcoxon rank-sum test
The Mann-Whitney test
None of these choices
When is the Tukey multiple comparison method used?
To test for normality.
To test equal variances.
To test for equality of a group of population means.
To test for differences in pairwise means.
Which statistical technique is appropriate when we wish to analyze the relationship
between two qualitative variables with two or more categories?
The chi-squared test of a multinomial experiment
The chi-squared test of a contingency table
The t-test of the difference between two means
The z-test of the difference between two proportions
Fisher’s least significant difference (LSD) multiple comparison method is flawed
because
it will increase α , the probability of committing a Type I error.
it will increase β , the probability of committing a Type II error.
it will increase both α and β , the probabilities of committing Type I and Type
II errors, respectively.
None of these choices.
Test the hypotheses whether there is no first-order autocorrelation in regression
residuals, given that: Durbin-Watson Statistic d = 1.12 , n = 45 , k = 5 , and
α = 0.05 .
Three people toss a coin and the odd man pays for coffee. If the coins all turn up the
same, they are tossed again. Find the probability that fewer than 4 tosses are needed.
In a random sample of n = 500 families owning television sets in the city of Hamilton,
Canada, it is found that x = 340 subscribed to HBO.
(一) Find a 95% confidence interval for the actual proportion of families in this city
who subscribe to HBO.
(二)How large a sample is required if we want to be 95% confident that our estimate of
p is within 0.02?
Suppose the probability is 0.8 that any given person will believe a tale about the
transgression of a famous actress. What is the probability that
(一) The sixth person to hear this tale is the fourth one to believe it?
(二) The third person to hear this tale is the first one to believe it?
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