Numerous studies haveshown that IQ scores have been increasing, generation bygeneration, for years (Flynn, 1984, 1999). The increase is calledthe Flynn Effect, and the data indicate that the increase appearsto be about 7 points per decade. To demonstrate this phenomenon, aresearcher obtains an IQ test that was written in 1980. At the timethe test was prepared, it was standardized to produce a populationmean of 100. The researcher administers the test to a random sampleof 16 of today's high school students and obtains a sample mean IQof 110 with standard deviation of 20. Is this result sufficient toconclude that today's sample scored significantly higher than wouldbe expected from a population with 100? Test this claim at the 5%significance level.
Fill in the blanks with the appropriate responses:
Hypotheses
H0: The mean IQ score is 100
H1: The mean IQ score is Blank 1100
(type in “less thanâ€, “greater thanâ€, or “not equaltoâ€)
Results
t = Blank 2 (enter the test statistic, use 2decimal places)
p-value = Blank 3 (round answer to nearestthousandth of a percent – i.e. 0.012%)
Conclusion
We Blank 4 sufficient evidence to support theclaim that the mean IQ is Blank 5 100 (pBlank 6 0.05).
(Use “have†or “lack†for the first blank, “less thanâ€,“greater than†or “not equal to†for the second blank and “<†or“>†for the final blank)
