Progress Check
Use this activity to assess whether you and your peers can:
Explain the meaning of each relevant item from the StatCrunch output when testing a claim about a mean.
Directions
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Three steps to complete the assignment
Prompt
In a previous lab we tested the following hypotheses, ?0: ?=4.73 and ??: ?<4.73 (where ? is the mean number of alcoholic drinks consumed by students at a liberal arts college).
In a random sample of 75 students, the mean was 3.93 alcoholic drinks consumed in a week. Here is the StatCrunch output from the hypothesis test.
?: Mean of variable
?0: ?=4.73
??: ??4.73Hypothesis test resultsVariableSample MeanStd. Err.DFT-StatP-valuenumber of drinks per week3.9333333 0.43592434 74 -1.8275343 0.0717 Using this context and the StatCrunch output, explain the meaning of each of the following.
Std. Err (standard error)
T-stat (T-score)
P-value
In a previous matched pairs lab we tested the following hypotheses, where ? is the mean of the differences in corn yield for a plot of land (regular seed minus kiln-dried ): H0 : µ = 0 and Ha : µ < 0. In a random sample of 11 seeds of each type, the mean of the differences in the sample was -33.7. Here is a StatCrunch print-out of the hypothesis test.
Paired T hypothesis test:
??=?1??2 : Mean of the difference between Regular seed and Kiln-dried seed
?0 : ??=0
?? : ??<0 Hypothesis test resultsDifferenceMeanStd. Err.DFT-StatP-valueRegular seed – Kiln-dried seed-33.72727319.95134610-1.69047610.0609Differences stored in column, Differences.
Using this context and the StatCrunch output, explain the meaning of each of the following.
Std. Err (standard error)
T-stat (T-score)
P-value.
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