Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys can be completed in a mean ti
me of 15 minutes or less. If a longer mean survey time is necessary, a premium rate is charged. Suppose a sample of 35 surveys produces the data in the Microsoft Excel Online file below. Use a known σ = 3.6 minutes. Is the premium rate justified? 20.3
a) Null hypothesis: the mean time of telephone surveys is less than or equal to 15 minutes. Alternative hypothesis: the mean exceeds 15 minutes. b) The computed test statistic is 2.15. c) The p-value found is 0.0158. d) NO, there is significant evidence to support that the mean survey time is fewer than 15 minutes, thus the premium rate is not warranted. Explanation: Data from Microsoft Excel includes: 17, 11, 12, 23, 20, 23, 15, 16, 23, 22, 18, 23, 25, 14, 12, 12, 20, 18, 12, 19, 11, 20, 21, 11, 18, 14, 13, 13, 19, 16, 10, 22, 18, 23. a) The null and alternative hypotheses stem from the assumption that Fowle Marketing Research Inc. bases its charges on the premise that the mean time of a telephone survey is 15 minutes or less.
Each coordinate pair indicates the quantity of crates and its associated cost. You can calculate the unit rate by performing division to find the y-value when the x-value equals 1.