True/False Mark each of the following with a (+) for true and a (-) for false.
____1. The paired t-test has no underlying distribution assumptions.
____2. The chi-square statistic is always greater than or equal to zero.
____3. If the population is normal, we would still prefer a nonparametric test.
____4. The following 2X2 table would have a chi-square test statistic of zero:
____5. A criticism of the sign test is that magnitudes have no importance.
____6. The sign test is a binomially based test.
____7. Ties are discarded when doing the paired-t test.
____8. As is the case with the Normal probability distribution, the Chi-Square distribution is symmetrical.
____9. The chi-squared test of independence assumes the data is dependent to determine
the expected frequencies.
____10. The degrees of freedom for a 4 x 5 contingency table would be 20.
True/False Mark each of the following with a (+) for true and a (-) for false
1) The paired t-test has no underlying distribution assumptions. :
false ie (-)
2) The chi-square statistic is always greater than or equal to zero. :
true ie (+)
3) If the population is normal, we would still prefer a nonparametric test.
false ie (-)
4) The following 2X2 table would have a chi-square test statistic of zero
false (-)
5 ) A criticism of the sign test is that magnitudes have no importance.
false (-)
6) The sign test is a binomially based test.
true (+) :
The sign test is a special case of the binomial test where the probability of success under the null hypothesis is p = 0.5
7) Ties are discarded when doing the paired-t test.
false (-)
8) As is the case with the Normal probability distribution, the Chi-Square distribution is symmetrical.
false (-)
9)
The chi-squared test of independence assumes the data is dependent to determine
the expected frequencies.
True (+)
10 ) The degrees of freedom for a 4 x 5 contingency table would be 20.
false (-)
True/False Mark each of the following with a (+) for true and a (-) for false....
TRUE/FALSE ____1. Personal selling has the most flexibility when it comes to communicating with the customer. ____2. Soft light can help create a mood and a sense of atmosphere in a store. ____3. Generally, employee evaluation is done by that worker’s peers. ____4. Price bundling offers different products for sale at one price to increase the number of goods bought at one time. ____5. Usually, a personal interview is not needed when hiring new employees.
a) true b) false 42. For a chi-square distributed random variable with 10 degrees of freedom and a level of sigpificanoe computed value of the test statistics is 16.857. This will lead us to reject the null hypothesis. a) true b) false 43. A chi-square goodness-of-fit test is always conducted as: a. a lower-tail test b. an upper-tail test d. either a lower tail or upper tail test e. a two-tail test 44. A left-tailed area in the chi-square distribution...
True or false? When the population variances are known, the test statistic that we use to compare two population means using two independent samples follows the standard normal distribution. True or false? A paired t-test with two columns of 8 observations in each column should use d.f =7
1) Answer the question True or False. 1) Nonparametric methods focus on the location of the probability distribution, rather than on specific parameters of the population. A) True B) False 2) Nonparametric tests are useful for qualitative data that can be ranked. A) True B) False 3) The sign test provides inferences about the population median rather than the population mean. A) True B) False 4) For a sign test to be valid, a large sample must be selected from...
True or False 6. T F n= 60 is used to separate the use of normal and t distributions in calculating confidence intervals for populations with unknown variances. 7. T F Decreasing α will shorten a confidence interval. 8. T F The chi square distribution is used to establish confidence intervals for variances. 9. T F At n= 20 and probability = .95, the t value is larger than the z value. 10. T F For the same α, the...
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Mark each of the following as true or false and justify your response. 1. If you fail to reject the null hypothesis, then the research hypothesis is false. 2. Independent variables may be linearly related. 3. A slope of 1.2 indicates that the independent variable changes 12 units for every 10 unit change in the dependent variable. 4. If a variable is normally distributed with a mean of 50 and a variance of 9, then approximately 68% of scores are...
For each of the following statements, are they true or false? a. (1) The covariance and correlation between two variables X and Y will always have the same sign. b. (1) Suppose X follows an exponential distribution. If we take samples of X of size n=50, then # should also follow an exponential distribution. C. (1) Suppose in a hypothesis test that the null hypothesis is rejected at a significance level of a = 0.05. All else being equal, the...
2. (2 True-False. Just say whether each statement is True or False – no need to justify your answer. 1. If the number of trials in the binomial distribution increases by 1 (and P equals .50), the probability of getting either of the most extreme possible outcomes (that is, 0 or N) is cut in half. 2. If the number of trials in the binomial distribution increases by 1 (and P does not equal .50), the probability of getting either of...
please give correct and answer all question.. this is revision question... 14. Which of the following statistical tests is BEST TO normally distributed data? in statistical tests is BEST to use for comparing two samples A. Independent sample t-test B.Mann-Whitney test C. Regression analysis D. Logistic regression analysis 15. Which of the following is NOT related to central limit theoret? sample size is large. bution of sample mean, x is approximately normal regardless of Xin the population 9. The mean...