A random sample of 81 automobiles traveling on a section of...

A random sample of 81 automobiles traveling on a section of an an interstate showed an average speed of 60 mph and a standard deviation of 13.5 mph. Assume the distribution of speeds of all the cars is normal. 1. Refer to Exhibit 8-2. If we are interested in determining an interval estimate for μ at 86.9% confidence, the Z value to use is 2. Refer to Exhibit 8-2. The standard error of the mean is 3. Refer to Exhibit 8-2. The 86.9% confidence interval for μ is 4. A sample of 16 elements from a normally distributed population is selected. The sample mean is 10 with a standard deviation of 4. The 95% confidence interval for μ is 5. The sample size needed to provide a margin of error of 2 or less with a .95 probability when the population standard deviation equals 11 is

Transcript

00:01 We know that from the given data there are four scales of measurements, four scales of measuring and they are nominal, nominal, which means they are named variables and there is no audible.

00:25 Next we have ordinal, which are named variables and have proper ordering, named variables and have proper ordering whereas normal was named variable with no proper ordering now next we have interval which have proper ordering and there is a proportionate interval between variables however there is no absolute zero in this no absolute zero now next coming to variable variable these are variables having proper ordering and these are proportionate between variables and here absolute zero can be accommodated absolute zero can be accommodated now coming to the first part of the question from the given data we can clearly see that unidon is a brown name unidon is a brand name therefore unidon is the nominal scale of measurement the nominal scale of measurement hence the is the correct solution for part one.

01:54 Now next, moving on to part b.

01:57 The phone models are named variables.

02:01 The phone models are named variables without ordering.

02:10 Are named variables without ordering.

02:19 Hence, the phone model uses a nominal scale again.

02:27 Again, it's a nominal scale.

02:29 This is the solution for part 2.

02:34 Now next we have the third part, that is, for the top time in hours column, we observe as follows.

02:46 We have the number of observations n is equal to 8 and mean will be given by x is equal to 1 over n, summation from i is equal to 1 to n x i, which will be equal to we have n value as 8, summation from i is equal to 1 to 8 x i.

03:05 Now just adding the sum of all values of the talk time, we get this required value as 8 .875, which means that mean new is equal to 8 .875 is the correct solution...

Question

Please give Ace some feedback