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1. A psychologist claims that the mean age at which female children start walking is 11.4 months. If 20 randomly selected female children are found to have started walking at a mean age of 11.5 months with standard deviation of 2 months, would you agree with the psychologist's claim? Assume that the sample came from a normal population.
2. Let U1 and U2 be independent random variables. Suppose that U1 is χ2 with ν1 degrees of freedom while U = U1 + U2 is chi-square with ν degrees of freedom, where ν > ν1. Then prove that U2 is chi-square random variable with ν - ν1 degrees of freedom.
find the standard normal area for each of the following round your answers to 4 decimal places.standardnormal areaa
the height of woman ages 20-29 is normally distributed with a mean of 64.4 inches. assuming the standard diviation
if a sample is subdivided into subsamples a minimal sample size of 30 is necessary for every subsample?a. trueb.
Find out the range of the following set of whole numbers: 12, 13, 15, 17, 12, 18, 12, 19, 13, 12, 14, 13, 12, 15
a directory of personal computer retail outlets in the united states contains 12080 alphabetized entries. explain how
Military radar and missile detection systems are designed to warn a country of enemy attacks. What is the probability that 1 detection system will detect an attack.
Suppose that 1% of all people have a particular disease. A test for the disease is 99% accurate. This means that a person who test positive for the disease has a 99% chance of actually having the disease
A measure of central tendency, and variability. Report the findings in the APA format and write a brief paragraph describing your findings.
consider the following bivariate data.point a b c d e f g h i jx 3 3 2 6 3 7 2 2 6 6y 7 1 5 6 3 7 5 7 2 5a construct a
The key steps to tests of significance are to state H0 and HA, calculate the test statistic, compute the p- value, and make a conclusion based on the given significance level.
the reading speed of second grade students in large city is approximately normal with a mean on 90 words per minute and
a person has a health saver plan with the likelihood of spending per year 1000 .10 2000 .20 30000.30 and 40000.4. with
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