Name:
Date:
Class Time:
Week 2 Worksheet 1
1. Look at the question #16 on your questionnaire. Create a frequency histogram using the
data.
2. Now, using the same data, create a relative frequency histogram.
3. Describe the distribution. (Center, variabili
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Name: /4M "QM/M K117
Math 140/ Spring 2011/ Alexander Bojkov/ CSUN
Test #1
Directions: No notes or cell phones are allowed during the test. Answer all questions clearly by
showing your work and justifying all statements. Box your answe
m
' the 4 subsections to approximate the yield of his orchard.
_(e) 24 Hour Fitness wants to administer a satisfattion survey to its current membersling its
membership roster, the club randomly selects 40 club membiers and asks them abou
Name: #SVWQ/r kg,
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Math 140! Spring 20% Alexander Bojkovl CSUN
Test #3
Directions: No notes or cell phones are allowed during the test. Answer all questions clearly
by showing your work and justifying all statements. Box your answers.
1. The length of
HOMEWORK 5 ANSWERS
1. Recall the class data we collected concerning body image (about right, overweight, underweight).
Following the body image example in OLI, answer the following question by completing the parts
below: Does it appear that body image ten
HOMEWORK 18
ANSWERS
1. Suppose we select a random sample of 100 students and find that 43% said they believe in love at
first sight. Which statement is NOT necessarily true?
a. there were 43 students in the sample who said they believe in love at first si
HOMEWORK 17
ANSWERS
1. For each of the following situations, define the parameter (using a symbol and words) and set up
appropriate null and alternative hypotheses about it. The parameter has been defined for you in the
first problem:
a. Under normal cond
Name:_
Math 140/ Spring 2011/ Alexander Bojkov/ CSUN
Test #3
Directions: No notes or cell phones are allowed during the test. Answer all questions clearly
by showing your work and justifying all statements. Box your answers.
1. The length of human pregnan
Name:
Date:
Time:
W8W1
1. Suppose that in order to estimate the proportion of all nickels in circulation in the U.S.
that are more than 10 years old, each student in a statistics class was asked to bring in 100
randomly collected nickels and check whether
HOMEWORK 13
ANSWERS
1. A fundraising organization typically gets a return from about 5% of the people on their mailing list.
To see what the response rate might be for future appeals, they hired a statistician to do a simulation
using sample sizes of 20,
HOMEWORK 13
ANSWERS
1. A fundraising organization typically gets a return from about 5% of the people on their mailing list. To
see what the response rate might be for future appeals, they hired a statistician to do a simulation
using sample sizes of 20,
HOMEWORK 15
ANSWERS
1. Whats the goal when using a confidence interval?
The goal of using a confidence interval is estimate the unknown population parameter. More
precisely, to give an interval for which any value in the interval is a plausible value of t
Name:
Date:
Time:
Week 3 Worksheet 1
1. Complete the table below using the first 10 numbers using #16 on your questionnaire.
# of Dollars Spent
Deviation from Mean
Squared Deviation
Sum
2. Rank the following samples from largest to smallest Standard Devia
Name:
Date:
Time:
W13W1 Hypothesis Test
Follow the steps exactly as described by your workbook. I have outlined the steps below, but
some additional sub steps are required.
You are being promoted to Lead Quality Inspector at Stat Foods, Inc. Your boss tel
Math 140 Questionnaire
Instructions: Your answers will become part of the class data base. Please answer each
question honestly, but do not give your name.
1) Have you ever enrolled in a college or high school statistics course before?
Yes
No
2) Which of
HOMEWORK 7 ANSWERS
1. Ten states were randomly selected from among the 50 United States. The data set below presents the
percentage of households in each state that were below the poverty level (Poverty Rate) and the
percentage of adults in the state who
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Name:
Date:
Class Time:
Class 2 Worksheet
1. For each of the following variables, indicate whether the variable is quantitative (Q) or
categorical (C).
a. Birth month (August)
b. Zip code
c. City
d. Number of classes taken
e. Days in a year
f. Number of m
HOMEWORK 12
ANSWERS
1. For each of the following, indicate whether what is described is a parameter or a population:
a. All four-inch ham sandwiches sold at Quiznos.
Population (a group of objects)
b. The average weight in ounces of all four-inch ham sand
HOMEWORK 11 ANSWERS
1. Suppose your Statistics professor reports test grades as z-scores, and you got a score of 2.20 on the
midterm exam. Are you happy? Write a sentence explaining what your score means, giving as much
detail as possible.
YES! That means
Name:
Date:
Time:
W12W1 M&M Hypothesis Testing
1. Mars, Inc. claims that 24% of M&M in a single bag are blue. You want to test to see if
this number is different or not. You take a sample of a single bag of M&M. Answer the
following questions. Use a 95% c
HOMEWORK 14
ANSWERS
1. A sample of size n is chosen randomly from a population that can be described by a Normal model
with mean and standard deviation . What is the sampling distribution model of sample means?
Describe the shape, center, and spread.
Shap
Name:
Date:
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W11W2
1. State the null and alternative hypothesis in both symbols and words.
a. The World Health Organization says bacon causes cancer is 9% of people. You
want to test to see if this percentage is lower.
b. The mean number of hours a c
Name:
Date:
Time:
W11W1
1. You want to rent an unfurnished one-bedroom apartment for next semester. The mean
monthly rent for a random sample of 100 apartments advertised in the local newspaper is
$540. Assume that the standard deviation is $80. (Obtained
Name:
Date:
Class Time:
Week 2 Worksheet 2
1. Refer to question #16 on your questionnaire. What number would you choose as your
typical value? Compare this value to the most frequent data entry.
2. Calculate the mean number of dollars using data from ques
Name:
Date:
Time:
W10W1
1. Suppose you are a quality control manager at Stat Foods, Inc. Your company sells bottles
of various types of drinks, but all drinks contain 26oz of product. Your job is to check to
make sure all the drinks going out the door do
Confidence Interval and Hypothesis Testing Practice
Enough data is given to be able to create a confidence interval and do a hypothesis test. I would
recommend that you interpret your confidence interval and do the 7 steps of a hypothesis test to
get prac