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Quiz

STATISTICS

raquel galindo 12 perguntas

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Perguntas do quiz (12)

  1. 1S_x ̅ =s⁄√n is an estimate of:
    1. Athe standard deviation of the sampling distribution of the mean
    2. Bthe standard error of the mean
    3. Co_x ̅ =o⁄√n
    4. Dall of the above
  2. 2The 68-95-99.7 rule indicates that for a normal distribution N(,o):
    1. A68% of the observations fall within 1 o of the mean 
    2. B95% of the observations fall within 1 o of the mean 
    3. C99.7% of the observations fall within 1 o of the mean 
    4. Dnone of the above
  3. 3The Law of the large numbers implies that
    1. AAs the simple size increases  will change being closer to x ̅
    2. BAs the simple size increases the difference between the parameter and the statistic will increase
    3. CAs the simple size increases the simple proportion p ̂ will be closer to the population proportion p
    4. DAll of the above
  4. 4When estimating the populational mean, as we increase the simple size
    1. AThe simple distribution becomes more concentrated (less disperse)
    2. BThe standard error decreases
    3. CThe accuracy of the inference increases
    4. DAll of the above
  5. 5Suppose we toss a fair coin 100 times. Knowing the true population of heads is 0,5 find out the 2 decimal approximation of the probability that the sample proportion of heads is between 0.4 and 0.6:
    1. A0.05
    2. B0.95
    3. C0.5
    4. Dnone of the above
  6. 6for a fixed simple size and standard error a confidence interval with a 99% confidence level is:
    1. Awider than a 95% confidence level interval
    2. Bnarrower than a 95% confidence level interval
    3. Cof the same width than a 95% confidence level interval
    4. Dwider or narrower depending on the standardized statistic (in relation to the parameter that is estimated)
  7. 7the F statistic in an ANOVA used to test an average differences always increases when:
    1. Athe within group variability increases
    2. Bthe between group variability increases
    3. Cthe total variability increases
    4. Dall of the above
  8. 8We are willing to conduct a paired-samples two tailed test on the difference between the populational means of x and y. The simple mean of x is 9 and the sample mean of y is 10; the simple size is 40. The variance of the difference in sample values is s_d^2=16. What is the conclusion of our test?




    1. AWe reject the null hypothesis, the populational means are significantly different
    2. BWe fail to reject the null hypothesis, the populational means are not significantly different
    3. CWe accept the null hypothesis, the populational means are the same
    4. DWe reject the null hypothesis, the populational means are not significantly different
  9. 9When the correlation coefficient between two variables x and y is larger
    1. AThe estimate for the slope of the regression line has a larger value (even when the slope is negative)
    2. BThe determination coefficient is also larger (even when the correlation is negative)
    3. CThe determination coefficient is smaller (even when the correlation is positive)
    4. DNone of the above
  10. 10If we find the following confidence interval for the slope of a regression β∁ (-0.5,1.5) at a 95% confidence level:



    1. AThe simple slope β ̂ is 0.5
    2. BThere is no significant linear association between x and y at a 5% significance level
    3. CThe simple correlation coefficient r is positive
    4. DAll of the above

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Quiz sobre STATISTICS, criado por raquel galindo em 21-06-2016.
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