Question
In: Statistics and Probability
The average cost of a traffic fine is $600 this year. It's claimed that the amount...
The average cost of a traffic fine is $600 this year. It's claimed that the amount has increased. Data collected from a simple random sample of 86 people that have been fined since January, showed that the mean amount was $720. With a standard deviation of $31.75, is there enough evidence to support the claim?
a) state null and alternative hypothesis and state the claim
b) Find the standardized test statistic. Show complete formula
c) Calculate p-value. Is the null hypothesis rejected? Why?
d) Interpret the decision.
Solutions
orchestra answered 2 years agoRelated Solutions
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A random sample of 33 taxpayers claimed an average of $9,668 in medical expenses for the...
A random sample of 33 taxpayers claimed an average of $9,668 in
medical expenses for the year. Assume the population standard
deviation for these deductions was $2,415.
Construct confidence intervals to estimate the average deduction
for the population with the levels of significance shown below.
a.
1 %
b.
5 %
c.
20 %
a. The confidence interval with a 1 % level of significance has
a lower limit of $ and an upper limit of $
A random sample of 33 taxpayers claimed an average of $9,668 in medical expenses for the...
A random sample of 33 taxpayers claimed an average of $9,668 in
medical expenses for the year. Assume the population standard
deviation for these deductions was $2,415.
Construct confidence intervals to estimate the average deduction
for the population with the levels of significance shown below.
a.
1 %
b.
5 %
c.
20 %
a. The confidence interval with a 1 % level of significance has
a lower limit of $ and an upper limit of $
A random sample of 37 taxpayers claimed an average of $9,527 in medical expenses for the...
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a.
5%
b.
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c.
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