Answer: 10 3.4641 2.8965 12.8965 Step-by-step explanation: Given: 10, 8, 12, 15, 13, 11, 6, 5 c = 95% a. The point estimate of the population mean is the sample mean. The mean is the sum of all values divided by the number of values: x = 10 + 8 + 12 + 15 + 13 + 11 + 6 + 5 /8 = 80/8 = 10 b. The point estimate of the population standard deviation is the sample standard deviation. The variance is the sum of squared deviations from the mean divided by n - 1. The standard deviation is the square root of the variance: s = /(10 – 10)^2 +.... + (5– 10)^2/8 – 1 s = 3.4641 c. Determine the t-value by looking in the row starting with degrees of freedom df = n-1 = 8 –1 = 7 and in the column with = (1 – c)/2 = 0.025 in table : t_/2 = 2.365 The margin of error is then: E = t_/2 * s/√n = 2.365 x s 3.4641/ √8 = 2.8965 d. The confidence intent)] then becomes: 7.1035 = 10 – 2.8965 = x – E <u />
Step-by-step explanation: well if there is lollipops for $2.50 each and they sold thrice as many lollipops then they have sold 7.5 of the lollipops and if you sell thrice of the cookies then that will be 31.5 and if you add 7.5 and 31.5 that will be 39 so the real answer is 389.
