Question
In: Statistics and Probability
a) A report says that the average amount of time a 10-year-old American child spends playing...
a) A report says that the average amount of time a 10-year-old American child spends playing outdoors per day is between 19.96 and 26 minutes. What is the margin of error in this report?
b) What is the margin of error for a poll with a sample size of 550 people? Round your answer to the nearest hundredth of a percent.
c) If you want a poll to have a margin of error of 3.26%, how large will your sample have to be? Round your answer to the nearest whole number.
d) An informal report says that the average amount of time a students works on math for Math 120 at CCCOnline is between 2.4 and 5.48 hours. What is the margin of error in this report?
Solutions
orchestra answered 2 years agoRelated Solutions
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Nike’s annual report says that the average American buys 6.5
pairs of sport shoes per year. Suppose the
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customers will be examined next year.
Use this information to determine the following questions based on
sampled means:
a. What is the standard error of the mean in this experiment?
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c. What is...
Madison is a 10 year-old African American girl. She loves playing the piano and composing her...
Madison is a 10 year-old African American girl. She
loves playing the piano and composing her own music. She is an avid
computer wiz, taking after her father. She has designed all the
family birthday cards and loves playing video games. When she comes
home from school, she has a sweet snack, finishes her homework, and
goes straight to the piano to practice. She spends hours at the
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Madison is 48...
is a 10 year-old African American girl. She loves playing the piano and composing her own...
is a 10 year-old African American girl. She loves
playing the piano and composing her own music. She is an avid
computer wiz, taking after her father. She has designed all the
family birthday cards and loves playing video games. When she comes
home from school, she has a sweet snack, finishes her homework, and
goes straight to the piano to practice. She spends hours at the
keyboard, and by mealtime she says she is hungry.
Madison is 48 inches...
Madison is a 10 year-old African American girl. She loves playing the piano and composing her...
Madison is a 10 year-old African American girl. She
loves playing the piano and composing her own music. She is an avid
computer wiz, taking after her father. She has designed all the
family birthday cards and loves playing video games. When she comes
home from school, she has a sweet snack, finishes her homework, and
goes straight to the piano to practice. She spends hours at the
keyboard, and by mealtime she says she is hungry.
Madison is 48...
You are trying to estimate the average amount a family spends on food during a year....
You are trying to estimate the average amount a family spends on
food during a year. In the past the standard deviation of the
amount a family has spent on food during a year has been
approximately $1000. If you want to be 99% sure that you have
estimated average family food expenditures within (error) $50, how
many families do you need to survey? Round your answer to a whole
number
1. An imaginary study states that an American household spends an average of $1250 per year...
1. An imaginary study states that an American household spends
an average of $1250 per year on soft drinks. The standard deviation
for the study is $225. If 30 American households are selected at
random, what is the probability that they spend an average of
between $1180 and $1270 per year on soft drinks?
2. The average number of deaths per week for Covid 19 patients
in the U.S. since March 21st is 9,433, with a standard deviation of
4733....
The average amount of time boys and girls aged 7 to 11 spend playing sports each...
The average amount of time boys and girls aged 7 to 11 spend
playing sports each day is believed to
be the same. A study is done and data are collected, resulting in
the data in the following table.
Sample Size
Average Number of Hours Playing
Sports per day
Sample Standard
Deviation
Girls
9
2
0.866
Boys
16
3.2
1.00
a. Define the appropriate parameter(s) and state the hypotheses
for testing if this study provides evidence that the mean amount...
A 10-month-old Central American child was referred to the laboratory for testing after being seen by...
A 10-month-old Central American child was referred to the
laboratory for testing after being seen by a pediatrician. The
phlebotomist noted that the child was very pale and listless. The
following tests were ordered: complete blood count (CBC), platelet
count, reticulocyte count, total serum bilirubin, total serum iron
and TIBC, and a stool examination for occult blood, ova, and
parasites.
The results were as follows:
■ Laboratory Data
Hemoglobin 5.6 g/Dl
Hct 24% RBC 3.5 ́ 1012/L
WBC 10.5 ́...
Joan and Andrew are concerned that their daughter, Fiona spends too much time on playing online...
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limit Fiona’s online time, they charge Fiona a user fee of $0.50
per hour. At this user fee, Fiona spends $10 on online games out of
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The amount of time a random person spends watching Netflix is being compared to the time...
The amount of time a random person spends watching Netflix is
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Time on Netflix
Time Exercising
14
7
8
12
3
9
24
2
19
5
11
12
a) Determine the value of the correlation
coefficient and interpret its meaning.
b) Suppose the time on Netflix is being used to
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