2. A normal distribution of scores has a mean of 120 and a standard deviation of 20.What score separates the top 40% of the scores from the rest?

Q: c) How many of the 15 data values fall within one standard deviation of the mean? Show how you found…

A: According to empirical rule, 68% of the data lie within 1 standard deviation of the mean.  Thus, if…

Q: The IQ of a person follows a normal distribution and has a mean of 100 and a standard deviation of…

A: It is given that the mean is 100 and standard deviation is 15.

Q: The sample standard deviation is one measure that describes the value in the sample that the data…

A: A single number that seeks to represent a set of data by identifying the center position within that…

Q: Psychological and educational tests, including MMPI are often designed so they have a mean of 50 and…

A: Given that  They have a mean of 50 and a standard deviation of 10.

Q: The department of public safety has an old memo stating that the number of accidents per week at a…

A: From the provided information, Sample size (n) = 52 Sample mean (x̅) = 2 Population standard…

Q: Calculate the raw score for the following -scores from a distribution with a mean of 15 and standard…

A: Given that, Mean = 15 sd = 3 The z-scores are 4.0, 2.2, -1.3, 0.46 To find the values of x for each…

Q: TRUE OR FALSE: A z-score indicates the number of standard deviations a data value is ab below the…

A: Standardized z-score: The standardized z-score represents the number of standard deviations the data…

Q: 19. Sketch a normal curve for the distribution. Label the x-axis values at one, two, and three…

A:

Q: IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation of 15. a. What…

A: Given DataMean = 100Standard Deviation = 15

Q: what does the mean and the standard deviation represent in data set? how would i interpret the…

A: Mean and standard deviation in data set:The mean represent the average value in a data set. In other…

Q: 5) An educational researcher wants to assess if the average IQ score of a sample of 40 students is…

A: Sample size n=40Sample mean=105Standard deviation=12

Q: Americans love ice cream .The annual per capita consumption of ice cream ,in pounds ,in the united…

A: We have given that,  X be the random variable from normal distribution with mean (μ) = 16.5 and…

Q: 14) Find the score that separates the top 80% from the bottom 20% if the Mean is 100 and the…

A: Given information Mean (µ) = 100 Standard deviation (σ) = 26 The score that separates the top 80%…

Q: Explain why we need to square the deviations from the mean in our calculation of the standard…

A: 3) The deviation formula is, Deviation=Xi-Mean In the formula Xi is individual scores.

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Given Information: Population mean (u) = 165  Standard deviation (σ) = 10  Score earned by a subject…

Q: Scores on the Wechsler Adult Intelligence Scale for the 20 to 34 age group are approximately…

A: