Question

The time it takes broken bones of a given size & type to heal is normally distributed . A random sample of 17 simple arm breaks occurring in people in their twenties took and average of 50 days to heal with a standard deviation of 5 days.) a) Find a 95% confidence interval (ci) for the healing time for all broken bones of this type b) Find a 95% (CI) for the population variance and standard deviation

Answer #1

The time it takes broken bones of a given size and type to heal
is normally distributed. A random sample of 17 simple arm breaks
occurring in people in their twenties took an average of 50 days to
heal with a standard deviation of 5 days.
A) Find a 95% confidence interval for the healing time for all
broken bones of this type
B) Find a 95% confidence interval for the population variance
and standard deviation

A group of researchers hypothesize that broken bones will take
longer to heal among smokers versus nonsmokers. They test this
question with a sample of 20 smokers, where the average time to
heal was 32 days (SS = 1161), and a sample of 45 nonsmokers, where
the average time to heal was 21 days (SS = 1179). Use the
critical-value approach for the appropriate statistical test (where
α = .05) to determine if there is a significant difference in bone...

2. I have a distribution of data that is skewed left with a
mean of 50 and a standard deviation of 15. I take 5000 samples each
of size 11 from this data set. Then the sampling distribution of
sample means will have:
a) Mean = _______ b) Standard deviation = _____________ c)
What shape distribution= _______
3. The mean length of time it takes for a broken arm to heal
is normally distributed with a mean of 44 days...

10 state which type of
parameter is to be estimated, then construct the confidence
interval
10.
A simple random sample of size 17 has mean x̄ = 8.44
and standard deviation s = 5.38. The population is
normally distributed. Construct a 95% confidence interval for the
population standard deviation
10 state which type of
parameter is to be estimated, then construct the confidence
interval
10.
A simple random sample of size 17 has mean x̄ = 8.44
and standard deviation...

The time it takes for robots to defect is normally
distributed with a mean time of 1,500 hours and a standard
deviation of 120 hours.
a) What is the probability that a robot will ‘break
down’ before 1680 hours?
b) What is the probability that a robot breaks down between
1380 hours and 1590 hours?

The time it takes to fill an order at an online retailer is
normally distributed 2 hours with a standard deviation of 0.5
hours. The time it takes to package an order for the same retailer
is normally distributed 0.3 hours with a standard deviation of .1
hours.
Find the probability that filling and packaging the order takes
more than 2 hours

4. The time that it takes a person to complete a survey is
normally distributed with a mean of 18 minutes and a standard
deviation of 3.5 minutes. (a) Find the 45’th
percentile.

A simple random sample of size n is drawn from a population that
is normally distributed. The sample mean x bar is found to be
109,
and the sample standard deviation, s, is found to be 10.
a. Construct 95% confidence interval about miu, if the sample
size n is 28. Find lower and upper bound.
b. Construct 95% confidence interval about miu, if the sample
size n is 17. Find lower and upper bound.
c.Construct 80% confidence interval about...

The time it takes to complete one biology experiment is normally
distributed with known standard deviation of 20 minutes. A random
sample of 64 experiments in the science school in UCLA had a mean
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the upper and lower confidence limits of a 95% confidence interval
for the population mean, m.

The time it takes a random person to get a haircut is Normally
Distributed, with an average of 23.8 minutes and a standard
deviation of 5 minutes. Assume that different people have
independent times of getting their hair cut. Find the probability
that, if there are four customers in a row (with no gaps in
between), they will all be finished getting their hair cut in 1.5
hours (altogether) or less.

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