The mean number of close friends for the population of people living in the U.S. is...

The mean number of close friends for the population of people living in the U.S. is 5.7. The standard deviation of scores in this population is 1.3. An investigator predicts that the mean number of close friends for introverts will be significantly different from the mean of the population. The mean number of close friends for a sample of 26 introverts is 6.5. Do these data support the investigator's prediction? Use an alpha level of .05.

a. Please state both the null and alternative hypotheses.

b. Please determine the critical region.

c. Please show all calculations needed to generate the appropriate statistic.

d. State your decision as to whether the investigator should reject the null hypothesis.

e. State the conclusion the investigator is entitled to draw.

Expert Solution

orchestra answered 2 years ago

The mean number of close friends for the population of people living in the U.S. is...

The mean number of close friends for the population of people living in the U.S. is 5.7. An investigator predicts that the mean number of close friends for introverts will be significantly different than the mean of the population. The mean number of close friends for a sample of 26 introverts is 6.5. The standard deviation of scores in this sample is 1.3. Do these data support the investigator's prediction? a. State the null and alternative hypotheses in symbolic form....

Many people believe that the average number of Facebook friends is 135. The population standard deviation...

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The mean number of close friends for the population of people living in the U.S. is...

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