A certain number of the Durban car commuters has a sample mean time of 35.8 to commute to work daily. Assuming that the population standard deviation is 11 minutes, standard error is 1.1 minutes and that commuting times are normally distributed. Identify the size of the sample. Select one: a. 100 b. 60 c. 70 d. 20

Assume the selling prices of homes in a particular community follow a normal distribution with a mean of $263,100 and a standard deviation of $43,200. Complete parts a through c. a. Determine the range of selling prices in this community that includes one standard deviation around the mean. The range is from $ to $ (Type integers or decimals. Use ascending order.) b. Determine the range of selling prices in this community that includes two standard deviations around the mean. The range is from $ to $ (Type integers or decimals. Use ascending order.) c. Determine the range of selling prices in this community that includes three standard deviations around the mean. The range is from $ to $1. (Type integers or decimals. Use ascending order.)

The instructor takes a random sample of size from the population data and obtains the following sample data:                   x 405 385 495 385 555 470   8 The sample standard deviation is, a 69.17     b 66.51     c 63.14     d 61.49

Find the standard deviation (rounded to the nearest unit) for the data indicated.   Test Score              Frequency 90   1         80   4         70   7         60   6         50   3

Solve only the part a, b and c for question 10.

Compute the standard deviation of the sampled proportions if p=.8 and n=50. Round to three places.

Assume the data set described is normally distributed with the given mean and standard deviation, and with n total values. Find the approximate number of data values that will fall in the given range. Mean-8 Standard deviation-1.5 n-45 Range: 6.5 to 9.5 In this case, we expect about 52 data values to fall between 6.5 and 9.5.

Both sets of values have an average of 13. Is set As standard deviation smaller, larger, or about the same as set abs? set A: 1 2 3 23 24 25 set B: 8 10 12 14 16 18

Suppose six pet food stores in the area were surveyed, and the following data shows how many types of pet food each of them carries. 7,7,9, 9, 11, 11 Calculate the sample mean and the sample standard deviation. Round your answers to three decimal places. T = Number Number S=

Steve's average golf score at his local course is 92.9 from a random sample of 60 rounds of golf. Assume that the population standard deviation for his golf score is 4.2. The standard error of the mean for this sample is ________. A)  0.54 B)  1.17 C)  1.56 D)  2.30