Search
Info
Warning
Danger

Study Resources (Statistics)

  11. A(n) ________ is a single number derived from sample data that is used to estimate the value of a population parameter. A.confidence interval B.frequentist interference C.interval estimate D.point estimate 12. For which of the following is the value of the estimator said to be biased? A.if the expected value of the estimator does not equal.
1 Views
View Answer
    41. In a curvilinear regression model, the ________ represents the curvilinear effect. A.intercept B.error term C.slope D.R Square   Use the data given below to answer the following question(s). Following is an extract from a firm's database detailing the number of hours spent on the job by employees and their corresponding pay. (Note: Assume a level of.
0 Views
View Answer
  11. What is the expected value for a 90 year-old piece of furniture? A.$1002.45 B.$997.98 C.$934.56 D.$1033.21 12. In a linear relationship, which of the following accounts for the many possible values of the dependent variable that vary around the mean? A.the coefficient of the dependent variable X B.the value of the intercept ß C.the random error term.
1 Views
View Answer
  46. Convenience sampling is an example of a probabilistic sampling method. 47. Estimators are the measures used to estimate population parameters. 48. Point estimates do not provide any indication of the magnitude of the potential error in the estimate. 49. The simple random sampling method is the only statistical sampling method that does.
0 Views
View Answer
  47. In predictive analysis models, a second-order polynomial has only one hill or valley. 48. Excel's Trendline feature cannot be used in modeling trends which include time variables. 49. The best-fitting line maximizes the residuals. 50. Creating a scatter chart with an added trendline is visually superior to the scatter chart generated by.
0 Views
View Answer
1. A regression model that involves a single independent variable is called ________. A.single regression B.unit regression C.simple regression D.individual regression 2. Regression models of ________ data focus on predicting the future. A.missing B.time-series C.panel D.cross-sectional The following table exhibits the age of antique furniture and the corresponding prices. Use the table to answer the following question(s). (Hint: Use scatter.
3 Views
View Answer
        Business Analytics, 2e   107       21.Which of the following is the probability mass function of the Bernoulli distribution? A.     B.         C.       D. 22.The binominal distribution: A.is a discrete distribution used to model the number of occurrences in some unit of measure. B.assumes that the average number of occurrences per unit is a constant and that occurrences are independent. C.is symmetric.
0 Views
View Answer
  41. In conducting a hypothesis test, what is usually to be proven statistically is identified as the null hypothesis. 42. If the alternative hypothesis includes the symbol <, the rejection region is in the upper tail. 43. For a two-sample test for means with the population variance being known, the Excel procedure used.
0 Views
View Answer
  21. What is the observed level of significance? A.0.4605 B.0.4191 C.0.0379 D.0.0420 22. Which of the following is the conclusion? A.This is a high probability and the conclusion is difficult. B.The null hypothesis is rejected. C.There are many sampling errors. D.The null hypothesis cannot be rejected. 23. Which of the following computes the test statistic for a one-sample test for.
0 Views
View Answer
  72. Two variables can only have a statistical relationship if there is a cause-and-effect factor between them. 73. A correlation of 0 indicates that the two variables have no linear relationship with each other. 74. According to the interquartile range, extreme outliers are more than 3*IQR away from the left of Q1.
0 Views
View Answer
  31. Which of the following helps in evaluation of autocorrelation? A.Breusch-Pagan test B.Durbin-Watson statistic C.Hosmer-Lemeshow test D.Cochran-Mantel-Haenszel statistics 32. In multiple regression, R Square is referred to as the: A.multiple correlation coefficient. B.coefficient of autocorrelation. C.coefficient of multiple determination. D.multiple significance coefficient. 33. Which of the following is true about multiple linear regression? A.It is a linear regression model with more.
0 Views
View Answer
  21. The R2 value: A.is the variability of the observed Y-values from the predicted values. B.indicates that as the independent variable increases, the intercept term does too. C.gives the proportion of variation in the dependent variable that is explained by the independent variable. D.transforms the cumulative probability scale (vertical axis) so that the graph.
0 Views
View Answer
  11. What is the confidence coefficient when the level of significance is 0.03? A.0.9700 B.0.0376 C.0.7924 D.0.7776 12. Which of the following denotes the power of the test? A.α B.1 - β C.β D.1 - α 13. Which of the following probabilities gives the confidence coefficient? A.P(rejecting H 0  | H0 is true) B.P(not rejecting H C.P(rejecting H 0  | H0 is false) 0  | H0.
1 Views
View Answer
  41.If P(X|Y) = P(X), it implies that event Y is dependent on event X. 42.The expected value and variance of the Poisson distribution are equal to ?. Answer:43.              The Excel function NORM.DIST finds probabilities for the standard normaldistribution.             Business Analytics, 2e   117       44.The beta distribution is a function of three parameters, the.
0 Views
View Answer
  40. Using the following data, test for the independence of the variables. (Note: Assume a significance level of 0.05 wherever necessary.) Respondent  Gender  Breakfast Preference 1 Female Fruits 2 Male Cereal 3 Male Milk 4 Female Fruits 5 Female Milk 6 Male Cereal 7 Male Milk 8 Male Milk 9 Female Fruits 10 Male Fruits 11 Male Cereal 12 Female Cereal 13 Female Milk 14.
0 Views
View Answer
    a/2 ,  what 41. A ________ is one that provides a range for anticipating the value of a new observation from the same population. A.prediction interval B.confidence interval C.t-distribution D.standard normal distribution 42. Which of the following is true of prediction intervals? A.It provides estimates for variables that can have only two possible outcomes. B.It is associated with the.
0 Views
View Answer
  39. During a study, individuals were asked to rate a product on a scale of 1-5. From the following data, help the researcher determine whether any significant differences exist in opinions among individuals from different regions. (Note: Assume a significance level of 0.05 wherever necessary.) Quintasia  Paraland  Bayundera 3 1 5 4 4.
1 Views
View Answer
      37.Compute the expected value of the random variable that denotes the possible summed scores from the two spinners.                                                                         38.Compute the variance of the random variable that denotes the possible summed scores from the two spinners.                                                                                                       .
0 Views
View Answer
      31.Which of the following distributions is appropriate when the probability of zero is very low, but the most likely value is just greater than zero? A.triangular distribution B.exponential distribution C.lognormal distribution D.beta distribution 32.Which of the following is true of the parameters of a beta distribution function? A.The parameters of the distribution function, a and ß,.
0 Views
View Answer
  31. Which of the following is true of the t-distribution? A.It has narrower confidence intervals than the standard normal distribution. B.It is only used to calculate confidence intervals where there is no known population standard deviation. C.It converges to the standard normal distribution as degrees of freedom increase. D.It does not require parameters such.
1 Views
View Answer
  51. Use Excel to calculate the variance of X. A.271.33 B.16.47 C.49.57 D.7.04 52. Use Excel to calculate the standard deviation for Y. Business Analytics, 2e   83 A.49.57 B.16.47 C.7.04 D.2.6 53. Use Excel to calculate the covariance between variables X and Y. A.2.67 B.0.02 C.16.71 D.7.04 54. Use Excel to calculate the z-score of X observation 27. A.-0.24 B.0 C.0.18 D.1.46 55. Use Excel to calculate the coefficient of variation.
0 Views
View Answer
  11.Identify the correct statement from the following. A.The events that a respondent is female and chooses Math are not independent. B.All events are independent of each other. C.The events that a respondent is male and chooses Science are not dependent. D.The events that a respondent is female and that she chooses Science are independent.           12.Which.
0 Views
View Answer
        48.Explain the similarity between the formulas for computing population mean and expected value of discrete random variable X.   value formula     49.How can normal probabilities be computed using Excel? Given the cumulative probability, how can the value of the random variable be found? 50.What is a random number? How is it generated in Excel?                     .
0 Views
View Answer
Business Analytics, 2e   99       Business Analytics (Evans) 1.Which of the following is true about the classical definition of probability? A.It is based on judgment and experience. B.If the process that generates the outcomes is known, probabilities can be deduced from theoretical arguments. C.The probability that an outcome will occur is simply the relative frequency associated.
3 Views
View Answer
1. Which of the following propositions describes an existing theory or belief? A.standard deviation B.null hypothesis C.proportion D.alternative hypothesis 2. Which of the following is the initial step in conducting a hypothesis test? A.collecting data and calculating a test statistic B.selecting a level of significance C.identifying the population parameter of interest D.determining a decision rule 3. Which of the following.
2 Views
View Answer
1. A ________ is a description of the approach that is used to obtain samples from a population prior to any data collection activity. A.population frame B.sampling weight C.sampling plan D.probability interval 2. Which of the following is true of judgment sampling? A.It selects samples based on expert opinion. B.It selects samples based on ease of data.
3 Views
View Answer
  47. How do test statistics for two-sample tests vary depending on whether the population standard deviations are known, and if not, whether they are assumed to be equal?   48. For a two-sample test, explain the procedure used when it is difficult to justify the assumption that the variances of each population.
0 Views
View Answer