Question

30. The data represents a sample of the number of home fires started by candles for the past 7 years in a certain city. 5460 5900 6090 6310 7160 8480 9930 (Check yourself: the sample mean is 7047 and sample standard deviation is 1616) a. Identify the variable in this set up b. Identify an individual in this set up c. Find and interpret the 99% confidence interval for the mean number of home fires started by candles each year, assume normal distribution. d. Does the confidence interval, at 99% confidence level, provide sufficient evidence that the mean number of home fires started by candles in this city is greater than 5000 per year Write an appropriate inequality to justify your answer.

Answer #1

The data below represent a random sample of the number of home
fires started by candles for the past several years. (From the
National Fire Protection Association.) Find the 90% confidence
interval for the mean number of home fires started by candles each
year. 5560 5900 6090 6210 7160 8440 9930 Which of the following is
the Real World Interpretation? There is a 90% chance that 5864.5
< µ < 8218.4 contains the true mean number of home fires
started...

Researchers have collected data from a random sample of six
students on the number of hours spent studying for an exam and the
grade received on the exam as given in Table 6.5.
Table 6.5
Observation
Grade
Number of Hours Studying
1
85
8
2
73
10
3
95
13
4
77
5
5
68
2
6
95
12
f) Find and interpret a 99% confidence interval for the mean
grade of all individuals who spend 10 hours studying.

A survey of 30 couples showed the sample mean number of meals
eaten outside their home was 1.75 meals per week, with a standard
deviation of 0.55 meal per week. Construct a 95% confidence
interval for the population mean number of meals eaten outside per
week.
Select one:
a. None of the other choices
b. 1.72 to 1.78 meals
c. 1.58 to 1.92 meals
d. 1.54 to 1.96 meals
Because of the relatively high interest rates, most consumers
attempt to...

1. For a company whose total number of employees is 100, we
collect data from 7 employees ,5.2, 4.1, 10, 6.8, 3.8, 8.0, and
8.3.
Using these data, write down the upper bound of the 99% CI for
population mean. Assume that these data are from a normal
distribution.
Please provide answer with 2 decimal points.
2. From a sample of size 250, number of females is 173. What is
the point estimate of population proportion?
Provide an answer with...

A random sample of 22 STAT 250 students was collected and the
file size of Data Analysis 2 was recorded. The data was measured in
megabytes. The instructors of the course claim that the file size
will be different from 5 megabytes. Consider the population of all
file sizes to be right skewed. Using a= 0.01, is there sufficient
evidence to conclude that the mean file size of Data Analysis 2 is
different from 5 megabytes? Conduct a full hypothesis...

The Reliable Housewares store manager wants to learn more about
the purchasing behavior of its "credit" customers. In fact, he is
speculating about four specific cases shown below (a) through (d)
and wants you to help him test their accuracy.
The average annual income of credit customers is less than
$48,000.
The true population proportion of credit customers who live in
an urban area exceeds 55%.
The average number of years lived in the current home is less
than 14...

ou have collected data on 1,037 residences in North Carolina to
analyze the most important determinant of home value. You believe
the chief determinants are size and location. To test this, you run
the following regression (t-statistics of coefficients in
parentheses):
HomeVal = 90.2 + 61.1 Bedrm
- 67.8
CrimeBad
R2=0.051
(-3.17). (1.90). (-7.63)
where HomeVal is the value of a home in thousands of
dollars, Bedrm is the number of bedrooms in the home, and
CrimeBad is equal to 1...

Part 1: z-Procedures In this part, we will use z-procedures.
z-procedures are both confidence intervals and hypothesis tests
that use a Normal distribution. They are called z-procedures
because they rely on a z-test statistic and/or a z-critical value.
So far, we can use z-procedures for a population mean knowing the
population standard deviation. In Part 1, you will use the data
file TempSample00-18.
(THIS IS DATA) YEAR,Month,High Temperature
2000,Jan,45
2000,Jan,48
2001,Jan,49
2003,Jan,62
2003,Jan,53
2004,Jan,42
2004,Jan,47
2005,Jan,40
2005,Jan,47
2006,Jan,48
2006,Jan,47
2007,Jan,51...

Texas is home to more than one million undocumented immigrants,
and most of them are stuck in low-paying jobs. Meanwhile, the state
also suffers from a lack of skilled workers. The Texas Workforce
Commission estimates that 133,000 jobs are currently unfilled, many
because employers cannot find qualified applicants (The Boston
Globe, September 29, 2011). Texas was the first state to pass a law
that allows children of undocumented immigrants to pay in-state
college tuition rates if they have lived in...

Everyday investment company Sharesies was launched in February
2017, after conducting research on New Zealanders’ attitudes
towards investing. Prior to launching the company, the co-founders
interviewed over 200 people asking them “If I gave you $50 right
now, and you had to do something with it in the next 5 minutes what
would you do?” Only 5 out of 200 people chose an option to save or
invest the $50. More popular options were bills, online shopping,
coffees, vouchers, food,...

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