Reference no: EM131501262

1) A survey of adults who attend at least one music concert a year found that 67% say concert tickets are too expensive. You randomly select 100 adults who attend at least one music concert a year. What is the probability that between 60 and 70 will say concert tickets are too expensive?

2) Suppose a random survey is conducted of 9 U.S. mothers who recently weaned their children. The average weaning age was 12.1 months with a standard deviation of 5.8 months. Conduct a hypothesis test to determine is the average weaning age in the U.S. is less than 12 months old. Use a 5% level of confidence.

In your answer, show your hypothesis your calculated z or t score , and your decision to accept or not accept the null hypothesis