statistics 5
For any z distribution of normally distributed scores, P50 is always equal to zero.
true
In a normal curve, the area contained between the mean and a score that is 2.30 standard deviations above the mean is 0.4893 of the total area.
true
The area beyond a z score of -1.12 is the same as the area beyond a z score of 1.12.
true
The normal curve is a symmetric, bell-shaped curve.
true
The standard deviation of the z distribution is always equal to 1.0.
true
z scores allow comparison of variables that are measured on different scales.
true
Would you rather have an income (assume a normal distribution and you are greedy) _________.
with a z score of 1.96
If you transformed a set of raw scores, and then added 15 to each z score, the resulting scores _________.
would have a standard deviation =1 and a mean of =15
In a normal curve, the inflection points occur at _________.
µ ± 1s
A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38. The stock price beyond which 0.05 of the distribution falls is _________.
$12.44
An economics test was given and the following sample scores were recorded: Individual A B C D E F G H I J Score 12 12 7 10 9 12 13 8 9 8 The z score for individual E is _________.
-0.47
A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38. The percentile rank of a price of $13.87 is _________.
98.78%
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what is the percentile rank of a score of 56?
11.70
A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38. The percentage of scores that lie between $9.00 and $10.00 is _________.
15.31%
An economics test was given and the following sample scores were recorded: Individual A B C D E F G H I J Score 12 12 7 10 9 12 13 8 9 8 The standard deviation of the distribution is _________.
2.11
A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38. The percentage of scores that lie between $9.00 and $10.00 is _________.
23.24% NOT THE ANSWER
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall between 70 and 80?
24.34
Assuming the z scores are normally distributed, what is the percentile rank of a z score of -0.47?
31.92
A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38. What percentage of the distribution lies below $7.42.
32.28%
A distribution has a mean of 60.0 and a standard deviation of 4.3. The raw score corresponding to a z score of 0.00 is _________.
60.0
A testing bureau reports that the mean for the population of Graduate Record Exam (GRE) scores is 500 with a standard deviation of 90. The scores are normally distributed. The raw score that lies at the 90th percentile is _________.
615.20
A distribution has a mean of 60.0 and a standard deviation of 4.3. The raw score corresponding to a z score of 2.02 is _________.
68.7
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall below a score of 83.8?
70.88
A testing service has 1000 raw scores. It wants to transform the distribution so that the mean = 10 and the standard deviation = 1. To do so, _________.
a and d
The z score corresponding to a raw score of 120 is _________.
impossible to compute from the information given
A set of raw scores has a rectangular shape. The z transformed scores for this set of raw scores has a _________ shape.
rectangular
Table A in your textbook has no negative z values, this means _________.
the table can be used with both positive and negative z values because it is symmetrical
A raw score that is 1 standard deviation above the mean of the raw score distribution will have a z score of 1.
true
All standard scores are z scores.
true
The area under the normal curve represents the percentage of scores contained within the area.
true
An economics test was given and the following sample scores were recorded: Individual A B C D E F G H I J Score 12 12 7 10 9 12 13 8 9 8 The mean of the distribution is _________.
10.00
S(z - µz) equals _________.
0
The z score corresponding to the mean of a raw score distribution equals _________.
0
A testing bureau reports that the mean for the population of Graduate Record Exam (GRE) scores is 500 with a standard deviation of 90. The scores are normally distributed. The proportion of scores that lie above 650 is _________.
0.0475
The proportion of scores less than z = 0.00 is _________.
0.50
A testing bureau reports that the mean for the population of Graduate Record Exam (GRE) scores is 500 with a standard deviation of 90. The scores are normally distributed. The proportion of scores that lie between 460 and 600 is _________.
0.5365
The standard deviation of the z distribution equals _________.
1
Makaela took a Spanish exam; her grade was 79. The distribution was normally shaped with mc047-1.jpg= 70 and s = 12. Juan took a History exam; his grade was 86. The distribution was normally shaped with mc047-2.jpg= 80 and s = 8. Which did better on their exam relative to those taking the exam?
Neither, they both did as well as each other.
The normal curve is _________.
bell-shaped
If the original raw score distribution has a mean that is not equal to zero, the mean of the z transformed scores will not equal zero either.
false
If the original raw score distribution is not normally distributed, the mean of the z transformation scores of the raw data will not equal 0.
false
It is impossible to have a z score of 30.2.
false
The normal curve reaches the horizontal axis in 4 standard deviations above and below the mean.
false
In a normal distribution approximately _________ of the scores will fall within 1 standard deviation of the mean.
maybe 70% NOT 95
All bell-shaped curves _________.
normal curves
An economics test was given and the following sample scores were recorded: Individual A B C D E F G H I J Score 12 12 7 10 9 12 13 8 9 8 The z score for individual G is _________.
not -1.42??
