Please answer these urgently it’s very important and I need it ASAP! Table 3: Ta
ID: 2907984 • Letter: P
Question
Please answer these urgently it’s very important and I need it ASAP!Table 3: Table for problem on jobs. 45 y|3|3 |6 |7 |9 |13 11. (5 points) A child psychologist wants to estimate the mean age at which a child learns to tall using a confidence interval. Find the sample size necessary for a 96% confidence interval with maximal error estimate 5 weeks for the mean age at which a child learns to talk. Assume ? 25 weeks. 12. Big Shoulders Insurance Company took a random sample of 50 insurance claims paid out during the last year and found that the mean was $1500 and the standard deviation was $120. (a) (5 points) a. Find and interpret a 95% confidence interval for the parameter of interest (b) (5 points) b. The industry standard for last year was an average claim of $1550. Based on your interval computed above, does it appear that Big Shoulder's claims are above average? Explain. 13. An economist is studying the job market in various neighborhoods in Denver, Colorado. Let r-total number of jobs in the neighborhood and let y-total number of entry level jobs in the neighborhood. A random sample of six neighborhoods was taken and the data are given in the table below (a) (5 points) Find the correlation coefficient. Find the equation of the least squares regression (b) (5 points) For a neighborhood with 40 jobs, how many entry level jobs are predicted? Is this interpolation or extrapolation
Explanation / Answer
Solution11:
E=5 weeks
standard deviation=sigma =25 weeks
z crit =96%=2.053749
n=(Zc*sigma/E)^2
=(2.053749*25/5)^2
=105.44
n=105
REQUIRED SAMPLE SIZE=105