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Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was 4.75 hours with a sample standard deviation of 2.0. Conduct a hypothesis test.
The null and alternative hypotheses are:
a. Ho: x ¯ = 4.5, Ha : x ¯ > 4.5
b. Ho: μ ≥ 4.5, Ha: μ < 4.5
q1. what is the purpose of sampling?a. to verify that the population is approximately normally distributedb. to
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A chi-square test of independence could be used to examine the relationship between overhead light preference (on or off) and glasses use.
Do teachers find their work rewarding and satisfying? An article reports the results of a survey of 398 elementary school teachers and 262 high school teachers
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How many students weigh less than 128 pounds? b) how many students weigh more than 165 pounds? c)how many students weigh between 135 and 165 pounds?
it is known that 62 of households in a neighborhood have cable tv. a sample of 8 houses was selected at random.
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