I am having trouble with these specific questions on estimating a population proportion. If I can please receive help, thank you

b: How many randomly selected air passengers must you survey? Assume that you want to be 90% condent that the sample percentage is within 5.5% of the true population percentage. Also assume that a prior survey suggests that about 37% of air passengers prefer an aisle seat. 6: A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. a: How many computers must he surveyed in order to be 99% condent that his estimate is in error by no more than three percentage points? b: How many computers must he surveyed in order to be 99% condent that his estimate is in error by no more than three percentage points? Assume that a recent survey suggests that about 94% of computers use a new operating system. Section 7.2: Estimating a Population Mean 7 a. A company that produces white bread is concerned about the distribution of the amount of sodium in its bread. The company takes a simple random sample of 100 slices of bread and computes the sample mean to be 103 milligrams and a sample standard deviation of 10 mg of sodium per slice. Construct a 95% confidence interval for the mean sodium level. 8 A clinical trial was conducted to test the e'ectiveness of a drug for treating insomnia in older subjects. After treatment, 17 subjects had a mean wake time of 94.7 min and a standard deviation of 21.6 min. Assume that the 17 sample values appear to be from a normally distributed population and construct a 99% condence interval estimate of the mean wake time for a population with drug treatments. .. 9 .. Listed below are student evaluation ratings of courses, where a rating of 5 is for \"excellent\". The ratings were obtained at one university in a state. Construct a condence interval using a 99% condence level. 3.6, 2.9, 4.3, 4.8, 2.8, 4.3, 3.7, 4.3, 4.1, 4.1, 4.3, 3.7, 3.4, 3.3, 4.1