Question
In: Statistics and Probability
A simple random sample of 20 customers is taken from a customer information file and the...
- A simple random sample of 20 customers is taken from a customer
information file and the average age is 27. The sample standard
deviation s is found to be
5.
(5 marks)
- Test the hypothesis that the population mean age is less than 29 using the critical value approach and a 0.10 level of significance.
-
- Test the hypothesis that the population mean age is different from 30 using the 0.05 level of significance.
Solutions
orchestra answered 1 year agoRelated Solutions
A simple random sample of 20 customers is taken from a customer information file and the...
A simple random sample of 20 customers is taken from a customer
information file and the average age is 27. The sample standard
deviation s is found to be
1.5.
(5 marks)
Test the hypothesis that the population mean age is less than
29 using the critical value approach and a 0.10 level of
significance.
Test the hypothesis that the population mean age is different
from 30 using the 0.05 level of significance.
.
simple random sample of 80 customers is taken from a customer information file and the average...
simple random sample of 80 customers is taken from a customer
information file and the average age is 34. The population standard
deviation σ is unknown. Instead the sample standard deviation s is
also calculated from the sample and is found to be 5.5. (6
points)
Test the hypothesis that the population mean age is greater
than 30 using the critical value approach and a 0.05 level of
significance.
Test the hypothesis that the population mean age is less than...
A simple random sample of 70 customers is taken froma customer information file and the average...
A simple random sample of 70 customers is taken froma customer
information file and the average age is 36. The population standard
deviation o is unknown. Instead the sample standard deviation s is
also calculated from the sample and is found to be 4.5. 2. Test the hypothesis that the population mean age is greater
than 33 using the critical value approach and a 0.05 level of
significance. а. Test the hypothesis that the population mean age
is less than...
a simple random sample of size 36 is taken from a normal population with mean 20...
a simple random sample of size 36 is taken from a normal
population with mean 20 and standard deivation of 15. What is the
probability the sample,mean,xbar based on these 36 observations
will be within 4 units of the population mean. round to the
hundreths place
A simple random sample of 70 Stat 20 students is taken from my class of 340...
A simple random sample of 70 Stat 20 students is taken from my
class of 340 students; the average number of units these students
is taking is 16.1, with an SD of 1.9. Last spring I taught a
smaller class with only 96 students, and those 96 students took an
average number of units of 15.5, with an SD of 2.2. Do a hypothesis
test to decide whether the average number of units for this
semester's Stat 20 class is...
A simple random sample of 25 observations will be taken from a population that is assumed...
A simple random sample of 25 observations will be taken from a
population that is assumed to be normal with a standard deviation
of 37. We would like to test the alternative hypothesis that the
standard deviation is actually more than 37. If the sample standard
deviation is 40 or more, then the null hypothesis will be rejected
(this called a decision rule).
What significance level would this decision rule cause?
If the population standard deviation is really 42, what...
In a simple random sample of size 50, taken from a population, 23 of the individuals...
In a simple random sample of size 50, taken from a population,
23 of the individuals met a specified criteria.
a) What is the margin of error for a 90% confidence interval for
p, the population proportion?
Round your response to at least 3 decimal places.
b) What is the margin of error for a 95% confidence interval for
p?
Round your response to at least 3 decimal places.
Students in Physics and Chemistry a random sample was taken from 20 students in Physics, from...
Students in Physics and Chemistry a random sample was taken
from 20 students in Physics, from which an average of 3 hours per
week was obtained with a deviation. typical of 2.5 hours, and
another sample of 30 independent chemistry students from the
previous one, which presented an average of 2.8 hours, with a
deviation. typical 2.7h. Assuming that the weekly study hours of
the two types of students follow a normal distribution,
(a) Calculate a 95% confidence interval for...
The following data is for a simple random sample taken from a normal population: 2.41 2.45...
The following data is for a simple random sample taken from a
normal population: 2.41 2.45 2.21 2.32 2.25 2.38
(a) Find a 95% prediction interval.
(b) Find a tolerance interval that contains 90% of the data with
95% confidence
The following data is for a simple random sample taken from a normal population: 2.41 2.45...
The following data is for a simple random sample taken from a
normal population: 2.41 2.45 2.21 2.32 2.25 2.38
(a) Find a 95% prediction interval.
(b) Find a tolerance interval that contains 90% of the data with
95% confidence
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