6. The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed. 2.0 3.2 1.8 2.9 0.9 4.0 33 29 3.6 0.8 Find a 94% confidence interval for the true mean a) (1.79 < <3.29) b) (1.55 < <3.53) c) (3.11 < <4.35) d) (2.12 < <3.14) 7. A survey of 2070 golfers showed that 347 of them were left handed. Find a point estimate for p, the population proportion of golfers that are left handed. a) 0.201 b) 0.167 c) 0.832 d) 0.168 8. A survey of 280 homeless persons showed that 63 were veterans. Construct a 90% confidence interval for the proportion of homeless persons who are veterans. a) (0.176