In a sample of 134 adults, the average (mean) reported hours of sleep is 6.90, with standard deviation 1.39.Is there evidence that American Adults sleep less than 7 hours? Use ?=0.05

(a)Step 1: Formulate the Null and alternate hypothesis: (use One-sided test (left))

(b)Step 2: ?=0.05

(c)Step 3 and Step 4:

Minitab> Stat >Basic Statistics >1-sample t> Summarized data>Sample size>134> Sample mean 6.90>Standard deviation>1.39> Select "Perform Hypothesis test> hypothesized mean> 7> Click Options> Alternative Hypothesis: MeanOK>OK

\fOne- Sample t for the Mean Summarized dots Sample Fine Standard deviation: Perform hypothesis Select Opticga. Grapha. Help CancelOne-Sample t: Options X Confidence level: 95.0 Alternative hypothesis: Mean