2 (b) State the null and alternative hypothesis. Identify which is the claim.? (i) A hospital found that fewer than 40% babies born in the hospital weighted more than 7 pounds. (ii) The average cost of a VCR is maximum $322.70 (iii) The average cost of men's athletic shoes is as low as $80. Question. 3 (a) A random sample of 56 American beech trees, the mean diameter was 0.20 meter, and the population standard deviation was 0.06 meter. Construct a 90% confidence interval for the population mean. Question. 3 b A random sample of 11 boys has the I.Q.'s. 84, 70, 120, 110, 101, 88, 83, 95, 107, 100, 98. Find 90% confidence interval for the population variance & standard deviation. Question. 4 (a) IESCO claimed that at most 80% of the parts which they supplied on a government contract conformed to specifications. A sample of 400 parts was tested, and 46 did not meet specifications. Can we accept the company's claim at a = 0.05 level of significance? Use P - value method