1.717 Question 6 (10 points) Question 6 (10 points) We want to estimate the population proportion of U.S. adults who play a musical Instrument. A study conducted in 2010 reported that 2106 of U.S. adults play a 40 Listen musical instrument. How many adults should be surveyed in our study if we want t have a 99% confidence with a margin of error of 5%? We want to estimate the population proportion of U.S. adults who play a mu instrument. A study conducted in 2010 reported that 21% of U.S. adults pla 441 adults musical instrument. How many adults should be surveyed in our study if we have a 99% confidence with a margin of error of 5%? 384 adults 441 adults 440 adults 383 adults 80 estion 7 (3 points) 10 Listen 3 4 6 E R Y U SO a D F G H % & Question 4 (3 points) Question 3 (6 points) 4 Listen A school counselor wants to know how smart the students in her school are. She gets funding from the principal to give an IQ test to a SRS of 40 students in the In a sample of 34 children, the mean age at which they first began to combine words school. The sample results include a mean of 119.78 and a standard deviation of was 16.51 months with a standard deviation of 9.59 months. If we want to 14.2. She wants to construct a 95% confidence interval for the mean IQ for stude construct a 90% confidence interval to estimate the population mean, what would in this school. What is the point estimate? the margin of error be? 14.2 2.66 40 2.71 119.78 2.59 117.98 2.78 stion 5 (5 points) stion 4 (3 points) Listen Listen the critical value t* needed to construct a 90% confidence interval with a ple size of 23. chool counselor wants to know how smart the students in her school are. She funding from the principal to give an IQ test to a SRS of 40 students in the