Statistics and Probability Answers

1.A bag contains 6 blue balls,4 red balls and 3 yellow balls.
(a.)If a ball is picked at random from the bag,find the probability that it is
red
red and blue
blue or yellow.
2.If two balls are picked at random from the bag (A) with replacement (B)without replacement
Find the probability that
both blue
the first is blue and the second is black
the same colour
different colours

To determine whether a new sleeping pill has an effect that varies with dosage, a researcher randomly assigns adult insomniacs, in equal numbers, to receive either 4 or 8 grams of the sleeping pill. The amount of sleeping time is measured for each subject during an 8-hour period after the administration of the dosage. What type of design is this, and what type of statistic is needed to analyze the data?

7 The following are graphical presentations except
chart
none of the above
pictogram
bar chart
8 The difference between Largest and Lowest values on a set of observation is called
range
median
mean
mode
9 Find the mean deviation of the distribution 12,6,7,3,15,10,18,5
4.25
2.97
4.05
4.38
10 Find the standard deviation of the distribution 12,6,7,3,15,10,18,5
4.87
4.97
2.21
5.81

4 A man kept 6 black, 5 brown and 7 purple shirts in a drawer. What is the probability of his picking a black shirt with his eyes closed ?

711
711

718
718

511
511

13
13
5 In how many ways can the word "HOSPITAL" be arranged?
45040
120
924
40320
6 In how many ways can the word "TOPOLOGY" be arranged
720 ways
56 ways
84 ways
21 ways

1 Find the median of the numbers 89, 141, 130, 161, 120, 131, 131, 100, 108, and 119.
148
125
136
124
2 In how many ways can a committee of 5 people be chosen out of 9 poeple?
254
126
120
131
3 Find the probabolity that a number selected at random from 40 to 50 is a prime.

19
19

17
17

311
311

114
114

7 In a study on survival time for ten patients following a new treatment for AIDS. The time in months were given thus: 24, 12, 8, 20, 3, 18, 24, 25,and 27.Determine the mean for the given data.
20
17.9
24
6.8
8 .......... is the science which deals with data collection, compilation, presentation, analysis and interpretation of numerical data for decision making.
sample space
sample
experiment
statistics
9 An ............ is a repetitive activity carried out for an expected result
experiment
sample
sample space
statistics
10 A ............. is the total collection of all the possible outcomes of an experiment
sample space
sample
experiment
statistics
Submit

4 In a study on survival time for ten patients following a new treatment for AIDS. The time in months were given thus: 24, 12, 8, 20, 3, 18, 24, 25,and 27.Determine the mode for the given data.
17.9
24
18
24
5 In a study on survival time for ten patients following a new treatment for AIDS. The time in months were given thus: 24, 12, 8, 20, 3, 18, 24, 25,and 27.Determine the range for the given data.
24
17
8
25
6 In a study on survival time for ten patients following a new treatment for AIDS. The time in months were given thus: 24, 12, 8, 20, 3, 18, 24, 25,and 27.Determine the median for the given data.
24
20
14.3
20.4

1 Descriptive measurement obtained from a whole population is termed as
statistics
sample
sample quote
parameter
2 Find the mean of 2t + 4, 5t - 4, 3t + 2, and 6t - 2
4
2t
4t
6t + 1
3 The mean of seven numbers is 10. If the sum of the first six terms is 62, find the number.
14
5
8
9

A researcher is examining preferences among four new flavors of ice cream. A sample of n = 80 people is obtained. Each person tastes all four flavors and then picks a favorite. The distribution of preferences is as follows. Do these data indicate any significance preferences among the four flavors? Test at the .05 level of significance.

Ice Cream Flavor

A 12

B 18

C 28

D 22

If value of x-bar is 70 and mu of sampling distribution is 15 with standard deviation is 20 then standard normal variable is?