Question

A poll conducted in 2012 asked a random sample of 1342 adults in the United States how much confidence they had in banks and other financial institutions. A total of 143 adults said that they had a great deal of confidence. An economist claims that less than 14% of U.S. adults have a great deal of confidence in banks. Can you conclude that the economist's claim is true? Use both α=0.10 and α=0.01 levels of significance and the P-value method with the TI-84 Plus calculator.

a. state null and alternative hypothesis. what tail is the hypothesis test?

b. Compute the value of the test statistic.

c. Using α=0.10, can you conclude that greater than 71% of emails are spam?

d. Using α=0.01, can you conclude that greater than 71% of emails are spam?

e. state conclusion

Answer 1

d) same as part (c) only

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e) we have enough evidence to conclude that the proportion is less than 14%