A customer service representative was interested in comparing the average time (in minutes) customers are placed on hold when calling Southern California Edison (SCE) and Southern California Gas (SCG) companies. The representative obtained two independent random samples and calculated the following summary information: SCE SCG Sample Size 9 12 Sample Mean 3.2 minutes 2.8 minutes Sample Standard Deviation 0.5 minutes 0.7 minutes Test whether there is a significant difference in average time a customer is on hold between the two companies, at the level of significance 0.1. Group of answer choices Since 0.1 < p-value < 0.2, one cannot conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.05 < p-value < 0.1, one cannot conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.1 < p-value < 0.2, one can conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.05 < p-value < 0.1, one can conclude that there is a significant difference in mean time a customer is on hold between the two companies.
A customer service representative was interested in comparing the average time (in minutes) customers are placed on hold when calling Southern California Edison (SCE) and Southern California Gas (SCG) companies. The representative obtained two independent random samples and calculated the following summary information: SCE SCG Sample Size 9 12 Sample Mean 3.2 minutes 2.8 minutes Sample Standard Deviation 0.5 minutes 0.7 minutes Test whether there is a significant difference in average time a customer is on hold between the two companies, at the level of significance 0.1. Group of answer choices Since 0.1 < p-value < 0.2, one cannot conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.05 < p-value < 0.1, one cannot conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.1 < p-value < 0.2, one can conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.05 < p-value < 0.1, one can conclude that there is a significant difference in mean time a customer is on hold between the two companies.
A customer service representative was interested in comparing the average time (in minutes) customers are placed on hold when calling Southern California Edison (SCE) and Southern California Gas (SCG) companies. The representative obtained two independent random samples and calculated the following summary information: SCE SCG Sample Size 9 12 Sample Mean 3.2 minutes 2.8 minutes Sample Standard Deviation 0.5 minutes 0.7 minutes Test whether there is a significant difference in average time a customer is on hold between the two companies, at the level of significance 0.1. Group of answer choices Since 0.1 < p-value < 0.2, one cannot conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.05 < p-value < 0.1, one cannot conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.1 < p-value < 0.2, one can conclude that there is a significant difference in mean time a customer is on hold between the two companies. Since 0.05 < p-value < 0.1, one can conclude that there is a significant difference in mean time a customer is on hold between the two companies.
A customer service representative was interested in comparing the average time (in minutes) customers are placed on hold when calling Southern California Edison (SCE) and Southern California Gas (SCG) companies. The representative obtained two independent random samples and calculated the following summary information:
SCE
SCG
Sample Size
9
12
Sample Mean
3.2 minutes
2.8 minutes
Sample Standard Deviation
0.5 minutes
0.7 minutes
Test whether there is a significant difference in average time a customer is on hold between the two companies, at the level of significance 0.1.
Group of answer choices
Since 0.1 < p-value < 0.2, one cannot conclude that there is a significant difference in mean time a customer is on hold between the two companies.
Since 0.05 < p-value < 0.1, one cannot conclude that there is a significant difference in mean time a customer is on hold between the two companies.
Since 0.1 < p-value < 0.2, one can conclude that there is a significant difference in mean time a customer is on hold between the two companies.
Since 0.05 < p-value < 0.1, one can conclude that there is a significant difference in mean time a customer is on hold between the two companies.
Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...
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