statistics

2. Why is it important to know the mean and standard deviation for a data set when applying the empirical rule?

3. If we are focused on 68% of the normal distribution, what percentage of the distribution is left in the upper tail only?

4. What value separates the 50% of the distribution from the other 50% of the distribution?

Consider this scenario for questions 5 - 8.

A standardized test was given to a set of high school juniors and the distribution of the data is bell shaped. The mean score is 800 and the standard deviation is 120.

5. Between which two scores did 95% of the students score?

6. To qualify for a special summer camp for accelerated students, a student must score within the top 16% of all scores on the test. What score must a student make to qualify for summer camp?

7. What score is 1/2 standard deviation above the mean?

8. A student scores 900 on the test. How many more points did the student need to qualify for summer camp?

  1. 👍 0
  2. 👎 0
  3. 👁 666
  1. 2. What empirical rule? Look at the problems you are given afterward.

    3. (1-.68)/2 = ? (This is assuming that the 68% are about the mean of a normal distribution.)

    4. Look at the definitions of they three measures of central tendency.

    5. Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (±.475) related to the Z scores. Insert in above equation and solve.

    6. Use same table and equation.

    7. Z = .5 Use equation.

    8. Relate to answer on 6.

    1. 👍 0
    2. 👎 0
  2. A student has a mean score of five tests taken. What score must she obtain on her next test to have a mean average of 88 on all six tests?

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Statistics

    A college statistics class conducted a survey of how students spend their money. They asked 25 students to estimate how much money they typically spend each week on fast food. They determined that the mean amount spent on fast

  2. math

    The following is a set of data from a sample of n = 5: 7 4 9 8 The following is a set of data from a sample of n = 5: 7 4 9 8 2 a. Compute the mean, median, and mode. b. Compute the range, variance, standard deviation, and

  3. Chem

    Am i correct for the following? 1. "quick data" such as that of a mass measurement on a balance located at the far side of the lab, can be recorded on a paper scrap and then transferred to the report sheet at your lab station.

  4. algebra

    Two similar data sets are being compared. The standard deviation of Set A is 4.8. The standard deviation of Set B is 6.5. Which statement about the data sets is true? a)The mean of the data in Set B is greater than the mean of the

  1. college math

    20. Calculate the range, variance, and standard deviation of the following data set: 5, 5, 6, 6, 6, 8, 8, 8, 8, 10, 10, 11, 12, 12, 20 (Points: 5) Range = 15; Variance = 225; Standard Deviation = 7.5 Range = 3.85; Variance = 14;

  2. statistics

    if the average number of textbooks in professors' offices is 16, the standard deviation is 5, and the average age of the professors is 43,with a standard deviation of 8 ,which data set is more variable ?

  3. math

    If someone asked: what can we learn from analyzing the standard deviation of a set of data that we couldn't learn from just looking at the measures of average, how would I answer? I know that average is the value or number in the

  4. Statistics

    The table below shows the LOS for a sample of 11 discharged patients. Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard

  1. statistics

    if the mean of a set of data is 23.00, and 12.60 has a z-score of -1.30, then what is the standard deviation?

  2. Math

    Roughly speaking, the standard deviation indicates how far, on average, the observations are from the mean. Do you think that for the data set below the standard deviation will give a good indication of the typical deviation from

  3. Algebra (Normal Distribution)

    The mean of a normally distributed data set is 12, and the standard deviation is 2. ___% of the data points lies between 8 and 16. Find the percentage

  4. Stat

    1) one indicator of a outlier is that an observation is more than 2.5 standard deviations from the mean. Consider the data value 80. (a) if a data set has mean 70 and standard deviation 5, is 80 a suspect outlier? be sure to work

You can view more similar questions or ask a new question.