Hypothesis test of one mean. 1. An engineer wants to measure the bias in a pH Meter. She uses the meter to measure the pH in 12 neutral substances (pH = 7.0) and obtains the data shown below. 7.01, 7.04, 6.97, 7, 6.99, 6.97, 7.04, 7.04, 7.01, 7.00, 6.99, 7.07 Use the = 0.05 level of significance to test if the pH meter is calibrated correctly,
Hypothesis test of one mean.
1. An engineer wants to measure the bias in a pH Meter. She uses the meter to measure the pH in 12 neutral substances (pH = 7.0) and obtains the data shown below.
7.01, 7.04, 6.97, 7, 6.99, 6.97, 7.04, 7.04, 7.01, 7.00, 6.99, 7.07
Use the = 0.05 level of significance to test if the pH meter is calibrated correctly,
Hypothesis test of one proportion.
2. In 2012, 58% of females aged 15 years of age and older lived alone according the US Census Bureau. A sociologist want to know if the percentage is different today. She obtains a rander sample of 500 females aged 15 years or older and finds that 285 are living alone. Is there
evidence to suggest that there is a change at a = 0.01 level of significance.
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