A random sample of 16 roundtrip flights between Philadelphia and Dallas has an average airfare of 422.10 with a sample standard deviation of 56.30. The 98 confidence interval around this sample mean is ________.
A) (415.06, 429.14)
B) (400.99, 443.21)
C) (365.80, 478.40)
D) (385.48, 458.72)
Q. 2The Kruskal-Wallis test is a nonparametric procedure that allows us to determine if a difference exists amongthe medians of three or more populations.
Indicate whether the statement is true or false
Q. 3A random sample of 16 roundtrip flights between Philadelphia and Dallas has an average airfare of 422.10 with a sample standard deviation of 56.30. The approximate standard error of the mean for this sample is ________.
A) 10.11
B) 14.08
C) 20.32
D) 24.19
Q. 4________ can be described as a self-correcting forecasting technique.
A) Simple moving average
B) Weighted moving average
C) Exponential smoothing
D) Multiplicative decomposition
Q. 5A random sample of 25 roundtrip flights between Philadelphia and Dallas has an average airfare of 393.50 with a sample standard deviation of 50.30. The 95 confidence interval around this sample mean is ________.
A) (372.74, 414.26)
B) (383.44, 403.56)
C) (353.26, 433.74)
D) (388.47, 398.53)
Q. 6The pH scale measures the amount of alkalinity or acidity in a liquid and ranges from 0-14. The ideal pH for a swimming pool is 7.2. A pH that is too high or low can cause discomfort for the swimmers, especially in the eyes.
High variability in the pH readings across the swimming pool can be problematic. The following data shows seven pH readings that were taken at the Wilson Community Pool from different locations at 10 A.M. this morning.7.0 6.9 7.2 7.1 7.4 7.4 7.3The pool management would like to test the hypothesis that the standard deviation of the pH readings across the pool is less than 0.40. The sample standard deviation is ________.A) 0.195
B) 0.240
C) 0.297
D) 0.358
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