Good day,

I hope you are well.

I would please like some assistance and explanations with each of the following questions about constructing a 95% confidence interval individually.

I look forward to your reply.

Question 1 10 points Save Answer The reaction times for a random sample of 8 persons to a stimulant were recorded as: 3 3.1 5 2.9 2.3 3 4.1 Find a 95% confidence interval for the mean of all reaction times. (Normality of reaction times is assumed). Give the lower limit. O 2.514 2.6991 O 2.9187 3.0303 Question 2 10 points Save Answer A sample of 170 gram tuna cans are randomly selected and the actual contents accurately measured. The results in gram are as follows: 167 169 171 175 170 172 169 Determine the lower limit if a 95% confidence interval is set up for the mean of the population. O 168.0491 O 2.5728 O 172.8081 O 166.8239 174.0333 Moving to another question will save this response. Question 3 10 points Save Answer A recent survey of 81 customers who frequently visit convenient stores in Kimberly found that the mean value of purchases was R 48.45, with the standard deviation of R18.58. Assume that the values are normally distributed. Construct a 95% confidence interval for the actual mean value of all purchases in convenient stores in Kimberly. Give the upper limit. O R 49.40 O R 52.58 O R 49.39 O R 52.50 O R 47.51 Moving to another question will save this response. > Question 6 10 points Save Answer A hospital administrator intends to improve the level of emergency-room service by increasing support personnel. To justify the increase, she must estimate the mean time patients must wait before being attended by a physician. For a random sample of 100 previously recorded emergencies, the sample mean time was 70.3 minutes, with a standard deviation of 28.2 minutes. Construct a 95% confidence interval that the administrator could use to estimate the actual mean waiting time. Give the lower limit. 63.0357 65.6611 64.7728 74.9389