Question
In: Statistics and Probability
Suppose a random sample of 500 adults from Santa Clara County answered this question: “in general,...
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Suppose a random sample of 500 adults from Santa Clara County answered this question: “in general, do you believe in ghosts?” 225 responded that they believe in ghosts. Test whether it is plausible that, if you could ask all adults in the Santa Clara County this question, less than half would say they believe in ghosts. Use the significance level of 0.01 for this test. Do not forget to follow those five steps.
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Suppose you believe that your long-time supplier of face masks produced less than 2% defective face masks.
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a) What are your null and alternative hypotheses for this problem?
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b) How do we commit a Type I error for this case?
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c) How do we commit a Type II error for this situation?
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Solutions
Total
number of sample taken is 500
orchestra answered 2 years agoRelated Solutions
I need this question answered assuming that Westgate Construction's contract with Santa Clara County does NOT...
I need this question answered assuming that Westgate
Construction's contract with Santa Clara County does
NOT qualify for revenue recongnition over time...
In 2016, the Westgate Construction Company entered into a contract
to construct a road for Santa Clara County for $10,000,000. The
road was completed in 2018. Information related to the contract is
as follows:
2016
2017
2018
Cost incurred during the year
$
2,400,000
$
3,600,000
$
2,200,000
Estimated costs to complete as of year-end
5,600,000
2,000,000
0...
In 2021, the Westgate Construction Company entered into a contract to construct a road for Santa Clara County for $10,000,000.
In 2021, the Westgate Construction Company entered into a contract to construct a road for Santa Clara County for $10,000,000. The road was completed in 2023. Information related to the contract is as follows:
2021
2022
2023
Cost incurred during the year
$
2,610,000
$
3,162,000
$
2,230,800
Estimated costs to complete as of year-end
6,390,000
2,028,000
0
Billings during the year
2,100,000
3,672,000
4,228,000...
In 2021, the Westgate Construction Company entered into a contract to construct a road for Santa Clara County for $10,000,000.
In 2021, the Westgate Construction Company entered into a contract to construct a road for Santa Clara County for $10,000,000. The road was completed in 2023. Information related to the contract is as follows:
Westgate recognizes revenue over time according to percentage of completion.
Required:
1. Calculate the amount of revenue and gross profit to be recognized in each of the three years.
2. Prepare all necessary journal entries for each of the years (credit “Cash, Materials, etc.” for...
In 2021, the Westgate Construction Company entered into a contract to construct a road for Santa Clara County for $10,000,000.
In 2021, the Westgate Construction Company entered into a contract to construct a road for Santa Clara County for $10,000,000. The road was completed in 2023. Information related to the contract is as follows:
2021
2022
2023
Cost incurred during the year
$
2,100,000
$
2,450,000
$
2,695,000
Estimated costs to complete as of year-end
4,900,000
2,450,000
0
Billings during the year
2,200,000
2,350,000
5,450,000...
A random sample of 500 male and female adults was asked the amount of time each...
A random sample of 500 male and female adults was asked the
amount of time each person spent watching TV last week. Their
responses are shown at the right. At the 0.05 significance level,
does it appear that the amount of time spent watching TV is related
to the gender of the viewer?
Hours/Gender
Male
Female
Total
Under 8
90
110
200
8 to 15
85
75
160
15 or more
75
65
140
Total
250
250
500
Which test...
In an opinion survey, a random sample of 1000 adults from the U.S.A. and 1000 adults...
In an opinion survey, a random sample of 1000 adults from the
U.S.A. and 1000 adults from Germany were asked whether they
supported the death penalty. 560 American adults and 590 German
adults indicated that they supported the death penalty. Researcher
wants to know if there is sufficient evidence to conclude that the
proportion of adults who support the deal penally in the US is
different than that in Germany. Use a confidence interval (at
confidence interval of 98%) to...
Suppose that a random sample of 13 adults has a mean score of 64 on a...
Suppose that a random sample of 13 adults has a mean score of 64
on a standardized personality test, with a standard deviation of 4.
(A higher score indicates a more personable participant.) If we
assume that scores on this test are normally distributed, find a
95% confidence interval for the mean score of all takers of this
test. Then complete the table below. Carry your intermediate
computations to at least three decimal places. Round your answers
to one decimal...
A simple random sample of 16 adults drawn from a certain population of adults yielded a...
A simple random sample of 16 adults drawn from a certain
population of adults yielded a mean weight of 63kg. Assume that
weights in the population are approximately normally distributed
with a variance of 49. Do the sample data provide sufficient
evidence for us to conclude that the mean weight for the population
is less than 70 kg? Let the probability of committing a type I
error be .01. 1. Write the hypotheses, indicate the claim 2. find
the critical...
In 2012, the General Social Survey asked a random sample of adults, "Compared to most people,...
In 2012, the General Social Survey asked a random sample of
adults, "Compared to most people, how informed are you about
politics?" Suppose that the following are the data classified by
their responses to this question and their age group (the data has
been modified slightly for testing purposes):
Not at All
A little
Somewhat
Very
Extremely
Age 20-29
7
29
28
13
0
Age 30-39
16
29
56
22
8
Age 40-49
3
24
50
26
14
Age 50...
Question 1 In the Payne County medical center, a surgical director selected a random sample of...
Question 1 In the Payne County medical center,
a surgical director selected a random sample of 37 nurses and found
that the mean of their ages was 39.40. The sample standard
deviation for the ages is 6.42. The director also selected a random
sample of 32 physical therapists and found the mean of their ages
was 36.77.
The sample standard deviation of ages for the physical
therapists is 4.48.
A. [3] Give one reason why this data should not be...
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