A cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of minutes used per day
The results of the sample included a sample mean of 34.5 minutes and a sample standard deviation equal to 11.5 minutes. Based on this information, and using a 95 percent confidence level:
A) the critical value is z = 1.96
B) the critical value is z = 1.645
C) the critical value is t = 2.093
D) The critical value can't be determined without knowing the margin of error.
C
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________ are appropriate when one or more variables can be identified as dependent variables and the remaining are independent variables
A) Interdependence techniques B) Dependence techniques C) Multivariate techniques D) Univariate techniques
An accountant is generally held to be the owner of the working papers he uses in performing an audit
a. True b. False Indicate whether the statement is true or false