# Stat 200 week 5 homework

NAME__________________                                                                        Score ______ / 50

STAT 200: Introduction to Statistics

Homework #5: Lesson 8, Sections 1-5 through Lesson 9, Sections 1-2

1.      (2 points) A claim is made that when parents use the XSORT method of gender selection during in-vitro fertilization, the proportion of baby girls is greater than 0.5.  The latest results show that among 945 babies born to couples using the XSORT method of gender selection, 879 were girls.

a.       (1 point) Express the original claim in symbolic form.

b.      (1 point) Identify the null and alternative hypothesis.

2.      (10 points) A 0.05 significance level is used for a hypothesis test of the claim that when parents use the XSORT method of gender selection, the proportion of baby girls is different from 0.5.  Assume that the data consists of 55 girls born in 100 births, so the sample statistic of 0.55 results in a z-score that is 1.00 standard deviation above 0.

a.       (1 point) Identify the null and alternative hypothesis.

b.      (1 point) What is the value of α?

c.       (1 point) What is the sampling distribution of the sample statistic?

d.      (1 point) Is this a two-tailed, left-tailed, or right-tailed test?  Why?

e.       (1 point) What is the value of the test statistic?

f.       (2 points) What is the P-value?

g.      (1 point) What is the critical value?

h.      (1 point) What is the area of the critical region?

i.        (1 point) What is the result of the hypothesis test (i.e. “Reject the Null Hypothesis” or “Fail to Reject the Null Hypothesis)?  Why?

3.      (8 points) The data set below contains data from a simple random sample of 100 M&Ms, 8 of which are brown (i.e. 8% or the proportion of 8 out of 100 are brown).  Use a 0.05 significance level to test the claim of the Mars Candy Company that the percentage of brown M&Ms is equal to 13%.

 Count Red Orange Yellow Brown Blue Green 1 0.751 0.735 0.883 0.696 0.881 0.925 2 0.841 0.895 0.769 0.876 0.863 0.914 3 0.856 0.865 0.859 0.855 0.775 0.881 4 0.799 0.864 0.784 0.806 0.854 0.865 5 0.966 0.852 0.824 0.840 0.810 0.865 6 0.859 0.866 0.858 0.868 0.858 1.015 7 0.857 0.859 0.848 0.859 0.818 0.876 8 0.942 0.838 0.851 0.982 0.868 0.809 9 0.873 0.863 0.803 0.865 10 0.809 0.888 0.932 0.848 11 0.890 0.925 0.842 0.940 12 0.878 0.793 0.832 0.833 13 0.905 0.977 0.807 0.845 14 0.850 0.841 0.852 15 0.830 0.932 0.778 16 0.856 0.833 0.814 17 0.842 0.881 0.791 18 0.778 0.818 0.810 19 0.786 0.864 0.881 20 0.853 0.825 21 0.864 0.855 22 0.873 0.942 23 0.880 0.825 24 0.882 0.869 25 0.931 0.912 26 0.887 27 0.886

a.       (1 point) Identify the null and alternative hypothesis.

b.      (1 point) Is this a two-tailed, left-tailed, or right-tailed test?  Why?

c.       (1 point) What is the value of the test statistic?

d.      (2 points) What is the P-value?

e.       (1 point) What is the critical value?

f.       (1 point) What is the area of the critical region?

g.      (1 point) What is the result of the hypothesis test (i.e. “Reject the Null Hypothesis” or “Fail to Reject the Null Hypothesis)?  Why did you respond with this answer, and what does it mean?

4.      (10 points) The data set in problem 3 presents a sample of 100 plain M&M candies that randomly selected (without replacement) from a bag which contained a total of 465 M&M candies.  The weight of each M&M (in grams) is recorded in the table above and in the available Excel Data Set file.  From this simple random sample, there were 19 green M&Ms with a mean of 0.8635 g and a standard deviation of 0.0570.  Use a 0.05 significance level to test the claim that the mean weight of all M&Ms is equal to 0.8535, which is the mean weight required so that M&Ms have the weight printed on the packaged label.

a.       (1 point) Identify the null and alternative hypothesis.

b.      (1 point) Is this a two-tailed, left-tailed, or right-tailed test?  Why?

c.       (2 points) What is the value of the test statistic?

d.      (2 points) What is the P-value?

e.       (1 point) What is the critical value?

f.       (1 point) What is the area of the critical region?

g.      (1 point) What is the result of the hypothesis test (i.e. “Reject the Null Hypothesis” or “Fail to Reject the Null Hypothesis)?  Why did you respond with this answer, and what does it mean?

h.      (1 point) Do green M&Ms appear to have weights consistent with the package label?

5.       (10 points) The Wechsler IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of normal adults.  Listed below (and in the Excel Data File) are the IQ scores of randomly selected professional pilots.  It is claimed that because the professional pilots are a more homogenous group than the general population (i.e. they are “more alike” than a random group of people), they have IQ scores with a standard deviation less than 15.  Test the claim using a 0.05 significance level.

 121 116 115 121 116 107 127 98 116 101 130 114

a.       (1 point) Identify the null and alternative hypothesis.

b.      (1 point) Is this a two-tailed, left-tailed, or right-tailed test?  Why?

c.       (2 points) What is the value of the test statistic?

d.      (2 points) What is the critical value?

e.       (2 points) What is the P-value?

f.       (1 point) What is the area of the critical region?

g.      (1 point) What is the result of the hypothesis test (i.e. “Reject the Null Hypothesis” or “Fail to Reject the Null Hypothesis)?  Why did you respond with this answer, and what does it mean?

6.      (10 points) Listed below (and in the available Excel Data Set file) are the PSAT and SAT scores from prospective college applicants.  The scores were reported by subjects who responded to a request posted by the web site talk.collegconfidential.com.  There is a claim that higher PSAT scores correlate to higher SAT scores.  Use this data set to argue for or against that claim.

 PSAT 183 207 167 206 197 142 193 176 SAT 2200 2040 1890 2380 2290 2070 2370 1980

a.       (1 point) Identify the null and alternative hypothesis.

b.      (1 point) Is this a two-tailed, left-tailed, or right-tailed test?  Why?

c.       (2 points) What is the value of the test statistic?

d.      (2 points) What is the critical value?

e.       (2 points) What is the P-value?

f.       (1 point) What is the result of the hypothesis test (i.e. “Reject the Null Hypothesis” or “Fail to Reject the Null Hypothesis)?  Why did you respond with this answer, and what does it mean?

g.      (1 point) Is there anything about the data that might make the results questionable?

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