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Systolic blood pressure results from contraction of the heart. Based on past resuts from the National Health Survey, it is claimed that women have systolic blood pressures with a mean of 130.7 and a standard deviation of 23.4. A random sample of 30 women resulted in blood pressure levels with a mean of 123.5 and standard deviation of 19.5. Use a 0.05 significance level to test the claim that the sample comes from a population with a standard deviation less than 23.4.
A company is interested in evaluating its current inspection procedure on shipments of 20 identical items. They take a sample of 5 and accept the shipment if no more than the allowed maximum of the samples are found to be defective.
A thorough examination reveals there is nothing wrong with the filling machine. From a statistical standpoint, was there a "type" error made? If yes, which type? Explain.
During the gestation period of 28 weeks, what percent of the babies born within each gestation period have a low birth weight (under 5.5 lbs)?
Set up the following null and alternative hypotheses for both factors and their interaction. You should have three verbal statements, not symbolized statements.
Produce the scatter plot for sodium and bp. Do you think there are any outliers?
On a particular day during the most recent golf tournament, the organizer placed the whole (pin) in 0 back left corner of the green. 64 golfers played the hole with the new placement on that day. Find out the probability of the sample average numb..
The Roller Products Company produces roller skates and skateboards. It has three production lines. Production line 1 makes skateboard platforms.
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
Find an unbiased estimator of mp(1 - p)/n. Find the optimal estimator using the Rao-Blackwell Theorem.
A recent study claimed that 15% of all eighth- grade students are overweight. In a sample of 80 students, 9 were found to be overweight. At a= 0.01, is there enough evidence to reject the claim using critical values?
She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
Sample standard deviation s=4.8. what is a point estimate off the difference between mean annual consumption in Webster City and the national mean?
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