Take Test: chapter 5 quiz Content Assistive Technology Tips [opens in new window] Test Information Instructions

90 minutes. Be sure to have your z-score table with you (Table A in the back of the book). The extra credit problem is tricky but worth two extra points if you get it- 12 out of 10 possible! Good luck!

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Question 1

1. In a normal curve, the values of the mean, median, and mode are the same:

   	a.	never
   	b.	always
   	c.	usually
   	d.	rarely

1 points

Question 2

1. To calculate a z-score from a raw score:

   	a.	add the mean, then divide by the standard deviation
   	b.	divide by the standard deviation then add the mean
   	c.	divide by the standard deviation, then subtract the mean
   	d.	subtract the mean, then divide by the standard deviation

1 points

Question 3

1. a z score indicates:

   	a.	how many standard deviations an observation is above or below its mean
   	b.	the position of the corresponding original score relative to the rest of the population
   	c.	both a and b
   	d.	none of the above

1 points

Question 4

1. given that IQ's are normally distributed with a mean of 100 and a standard deviation of 15, approximately what proportion of IQs are below 110?

   	a.	.25
   	b.	.75
   	c.	.50
   	d.	none of the above

1 points

Question 5

1. Given that IQs are normally distributed with a mean of 100 and standard deviation of 15, what proportion of IQ's fall between 130 and 145?

   	a.	.02
   	b.	.05
   	c.	.08
   	d.	none of the above

1 points

Question 6

1. Given that IQ's are normally distributed with a mean of 100 and a standard deviation of 15, what pair of IQs separate the middle 95% of the population from the remainder of the distribution?

   	a.	68 and 132
   	b.	71 and 129
   	c.	79 and 121
   	d.	none of the above

1 points

Question 7

1. An individual score of 140 on a biology test would be relatively highest compared to the rest of the class if which of the following were true about the distribution of scores in the class as a whole?

   	a.	mean of 100, standard deviation of 20
   	b.	mean of 80, standard deviation of 30
   	c.	mean of 120, standard deviation of 5
   	d.	mean of 135, standard deviation of 1
   	e.	mean of 120, standard deviation of 10