Homework Answers

possible sample of size 2 which can be drawn without replacement

possible sample of size 2 which can be drawn without replacement

Random samples of size 3 are taken from a population of the numbers 3, 4,5,6, 7,8,and 9.

1. How many samples are possible? List them and compute

the mean of each sample. 2. Construct the sampling distribution of the sample means.

3. Construct the histogram of the sampling distribution of

the sample means. Describe the shape of the histogram.

1. Suppose X is normally distributed with a mean of 5 and a standard deviation of 0.4.Using

  the standard score formula,we findP(X ≤ Xo)=P(Z ≤ 1.3).What is the value of Xo?

1.The population of SULU Horn bill (one of the endangered bird species in the Philippines) has a standard deviation of 40. An environment researcher wants to construct a 90% confidence interval if the sample size is 150 and the sample mean is 65.

a. What is the margin of error

b. Construct the confidence interval

c. Find the leng of the confidence interval

2. The average price of 350 cellphones is Php 13,500 with a sample standard deviation of Php 750. A market researcher desires a 99% level of confidence in the true average price of cellphones

a. What is the margin error

b. Construct the confidence interval

c. Find the length of the confidence interval

Given

1. E = 0.03, 0 =

o = 0.57,

90% confidence

2. E = 0.15, o = 1.2,

95% confidence

3. E = 0.05, o = 0.45,

99% confidence

n=

n=

n=

Solution and Answer

Activity 2: Maximum Error E

Activity 2: Maximum Error E

Assuming that the samples come from a normally distributed population, find

the maximum error E given the following:

Given

Solution and Answer

1.

n = 10, X= 28, s = 4.0,

90% confidence

2. n = 16, X= 50, s = 4.2,

95% confidence

3. n = 25, X= 92.8, s = 2.6,

99% confidence

Assuming that the samples come from a normally distributed population, find

the maximum error E given the following:

Given

Solution and Answer

1.

n = 10, X= 28, s = 4.0,

90% confidence

2. n = 16, X= 50, s = 4.2,

95% confidence

3. n = 25, X= 92.8, s = 2.6,

99% confidence