00:01
As in this question, we need to calculate here 95 % of confidence interval for mean diameter.
00:13
So, first we will create a table for mean.
00:20
Mean is bar x and the value is calculated by the formula sum of all values sum of all values xi divided by n.
00:28
So, here the sum of all values which are given in the question the sum will be equal to 7 .97 and number of observations are 9.
00:39
So, when we calculate our mean, so bar x the mean will be summation of xi divided by n that is 7 .97 divided by 9 which will be equal to 0 .8856.
00:55
So, here we have our mean and now we can tabulate our table.
00:58
So, this is our value for x minus x bar in the next column.
01:03
Here we have placed the sum for the columns and these are all the values then x minus x bar whole square is calculated and here is the sum for the value.
01:13
So, now when we calculate our variance that is from the formula that is x minus sum of all values of x minus x bar whole square divided by n...