Question

Stock prices: Following are the closing prices of a particular stock for each trading day in May and June of a recent year.

		May
884.74	900.68	900.62	886.25	820.43	875.04
877.00	871.98	879.81	890.22	879.73	864.64
859.70	859.10	867.63	880.37	877.07	873.65
866.20	869.79	829.61

		June
906.97	908.53	909.18	903.87	915.89	887.10
877.53	880.23	871.48	873.63	857.23	861.55
845.72	871.22	870.76	868.31	881.27	873.32
882.79

(a) Find the mean and median price in May. Round the answers to at least two decimal places.

(b) Find the mean and median price in June. Round the answers to at least two decimal places.

(c) Does there appear to be a substantial difference in price between May and June, or are the prices about the same?

Answer 1

R CODE:-

> x1
[1] 884.74 900.68 900.62 886.25 820.43 875.04 877.00 871.98 879.81 890.22
[11] 879.73 864.64 859.70 859.10 867.63 880.37 877.07 873.65 866.20 869.79
[21] 829.61
> x2
[1] 906.97 908.53 909.18 903.87 915.89 887.10 877.53 880.23 871.48 873.63
[11] 857.23 861.55 845.72 871.22 870.76 868.31 881.27 873.32 882.79

> mean(x1)
[1] 872.1076
> mean(x2)
[1] 881.3989
> sort(x1)
[1] 820.43 829.61 859.10 859.70 864.64 866.20 867.63 869.79 871.98 873.65
[11] 875.04 877.00 877.07 879.73 879.81 880.37 884.74 886.25 890.22 900.62
[21] 900.68
> sort(x2)
[1] 845.72 857.23 861.55 868.31 870.76 871.22 871.48 873.32 873.63 877.53
[11] 880.23 881.27 882.79 887.10 903.87 906.97 908.53 909.18 915.89
> median(x1)
[1] 875.04
> median(x2)
[1] 877.53