Question

*The mean endurance time for a sample of 36 girls 4-5 years
old was 9.5 minutes with a standard deviation of 1.86 minutes. If
we assume that these are the true population mean and standard
deviation, and if we also assume that the endurance time follows a
normal distribution, what is the probability of observing 4 year
old girl with an endurance of 7 minutes? Is the data set normally
distributed? Explain your answer.*

Answer #1

Babies: A sample of 25 one-year-old girls had a mean weight of
24.1 pounds with a standard deviation of 4.3 pounds. Assume that
the population of weights is normally distributed. A pediatrician
claims that the standard deviation of the weights of one-year-old
girls is less than 4 pounds. Do the data provide convincing
evidence that the pediatrician's claim is true? Use the 0.01 level
of significance.

3. The mean delivery time is 36 minutes and the
population standard deviation is six minutes. Assume the sample
size is 81 restaurants with the same sample mean. Find a 90%
confidence interval estimate for the population mean delivery
time.
6.If in a sample of size n=49 selected normal population, the
sample mean X=48 and population standard deviation is 21, what is
your statistical decision, if your H0 :µ = 45, α=0.05

In a random sample of 21 ?people, the mean commute time to work
was 31.5 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a? t-distribution to
construct a 80?% confidence interval for the population mean ?.
What is the margin of error of ???
Interpret the results.

In a random sample of 28 people, the mean commute time to work
was 33.5 minutes and the standard deviation was 7.3 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 90% confidence interval for the population mean
muμ.
What is the margin of error ofmuμ?

In a random sample of 29 people, the mean commute time to work
was 30.1 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 80% confidence interval for the population mean μ?
What is the margin of error of μ? Interpret the results.

In a random sample of 22 people, the mean commute time to work
was 32.1 minutes and the standard deviation was 7.3 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 99% confidence interval for the population mean μ.
What is the margin of error of μ? Interpret the results.

In a random sample of 18 people, the mean commute time to work
was 32.4 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 99% confidence interval for the population mean mu.
What is the margin of error of mu? Interpret the results.

In a random sample of 28 people, the mean commute time to work
was 33.6 minutes and the standard deviation was 7.1 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 99% confidence interval for the population mean μ.
What is the margin of error of μ? Interpret the results.

in a random sample of 24 people, the mean commute time to work
was 33.7 minutes and the standard deviation was 7.1 minuets .
assume the population is normally distributed and use a
t-distribution to construct a 99% confidence interval for the
population mean. what is the margin of error of the mean? interpret
the results.

In a random sample of 18 people, the mean commute time to work
was 33.1 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 98% confidence interval for the population mean mu .
What is the margin of error of mu? Interpret the results.
The confidence interval for the population mean mu is:
The margin of error of mu is:

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 17 minutes ago

asked 21 minutes ago

asked 23 minutes ago

asked 33 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago