STAT 2023 quiz 2 -- osu

The following sample is a set of observations on the daily point change for the stock of an oil well services company: 3.2, -4.6, 2.5, -3.9, 4.1, -3.4What is the sum of the data?

-2.1

The weekly changes in a major stock were recorded for 8 weeks during the past month. The changes in percent are stated below. 2.1, 5.2, 2.8, -3.4, 1.1, -2.2, 1.2, -0.4. What is the mean of the data?

0.8

If from a data set with 14 observations the sum of squares is 287 and the square of sum is 196 what is the numerical value of the sample mean?

1

A random sample of eight roadrunners was collected in the Oklahoma panhandle and the heights in inches of each of the road runners are: 12.6, 15.2, 14.8, 13.1, 12.9, 14.7, 14.2, 13.2What is a numerical value for the standard deviation of the sample of road runner heights?

1.001

The percent changes in daily price for a specific stock are 8.1, 2.2, -5.6, 0.8, -2.6, 4.0, -2.1, and 3.6. What is the observed percent mean change in the daily price of this specific stock based on these data?

1.1

A random sample of eight roadrunners was collected in the Oklahoma panhandle and the heights in inches of each of the road runners are: 12.6, 15.2, 14.8, 13.1, 12.9, 14.7, 14.2, 13.2What is the numerical value of the square of the sum for the sample of roadrunner heights?

12,254.49

A random sample of eight roadrunners was collected in the Oklahoma panhandle and the heights in inches of each of the road runners are:12.6, 15.2, 14.8, 13.1, 12.9, 14.7, 14.2, 13.2What is the numerical value of the mean for the sample of roadrunner heights?

13.8

What is the numerical value of the standard deviation of a sample of six observations, 62, 26, 42, 24, 46, and 25?

15.25

During an extended draught in Oklahoma, many water wells went dry and new wells were drilled. The following sample of well depths is the number of feet required for new water wells to provide a significant amount of water per day. 245.6, 232.2, 253.8, 229.1, 144.9, 251.7, 335.2, 253.1What is the value of the mean of the sample of well depths?

243.2

During an extended draught in Oklahoma, many water wells went dry and new wells were drilled. The following sample of well depths is the number of feet required for new water wells to provide a significant amount of water per day. 245.6, 232.2, 253.8, 229.1, 144.9, 251.7, 335.2, 253.1.What is a value for the median of the sample of well depths?

248.65

If a random sample of 50 observations produces a sum of squares equal to 2,397.12 and a square of the sum equal to 80,656 what is the numerical value of the sample standard deviation?

4

The following sample is a set of observations on the daily point change for the stock of an oil well services company: 3.2, -4.6, 2.5, -3.9, 4.1, -3.4What is the square of the sum of the data?

4.41

During an extended draught in Oklahoma, many water wells went dry and new wells were drilled. The following sample of well depths is the number of feet required for new water wells to provide a significant amount of water per day. 245.6, 232.2, 253.8, 229.1, 144.9, 251.7, 335.2, 253.1What percent of the well depths are less than 250 feet?

50%

During an extended draught in Oklahoma, many water wells went dry and new wells were drilled. The following sample of well depths is the number of feet required for new water wells to provide a significant amount of water per day. 245.6, 232.2, 253.8, 229.1, 144.9, 251.7, 335.2, 253.1What is the value of the standard deviation of the sample of well depths?

51.7

If the position of the median in a data set is 27.5, how many observations are in the data set?

54

The weekly changes in a major stock were recorded for 8 weeks during the past month. The changes in percent are stated below. 2.1, 5.2, 2.8, -3.4, 1.1, -2.2, 1.2, -0.4. What is the sum of the squares of the data?

58.5

Supposed that 6 randomly chosen utility bills were the following amounts, $158, $255, $88, $139, $98, and $218. What is the standard deviation associated with these 6-utility bills?

66

The weekly changes in a major stock were recorded for 8 weeks during the past month. The changes in percent are stated below. 2.1, 5.2, 2.8, -3.4, 1.1, -2.2, 1.2, -0.4. What is the sample variance of the data?

7.63

If the mean of a data set is less than the median and the median is less than the mode of the data set, then the distribution is right skewed.

false

If the range in a mound-shaped data set is 75 units, then it is reasonable that the standard deviation is 25 units.

false

The mean and the median of a data set are the same value since the mean is the average and the median splits the data set down the middle.

false

The numerical measures of variation include mean, mode, and median.

false

If the mean, median, and mode of a data set are all equal, then the data set is symmetric.

true

If the range in a mound-shaped data set is 150 units, then it is reasonable that the standard deviation is 25 units.

true

The numerical measures of centrality include mean, mode, and median.

true

The weight of a dog pack with 6 big dogs, who each weigh between 50 and 80 pounds, has a higher mean and a lower variance than the weight of a dog pack with three big 60-pound dogs and three Chihuahuas, who each weigh less than ten pounds.

true