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1. Describe the two components of a random sample.
2. If n = 10 observations are randomly sampled from a distribution with mean µ = 9 and variance σ2 = 8, what is the mean and variance of the sample mean?
3. Determine E(X‾) and σx2 for a random sample of n = 12 observations from a discrete distribution with the following probability function:
X:
1
2
3
4
P(x):
.2
.1
.5
When adding or subtracting expressions, how do you identify the like terms?
The mean SAT verbal score is 412, with a standard deviation of 90. Use the Empirical Rule to determine what percent of the scores lie between 412 and 592.
suppose that when a 7.0 earthquake hits it will destroy each highway independently with probability p 03. a town
we measure the self-esteem scores of a sample of statistics students reasoning that this course may lower their
Describe your situation and why more than one solution is possible - Write an inequality to model the situation and solve this inequality.
a fair coin is tossed three times. let x be the number of heads that turn up on the first two tosses and y be the
A survey of Kentucky fire departments was conducted to assess their respiratory protection practices, barriers to program implementation, and medical evaluation programs. A 62% survey response rate was achieved.
To qualify for language honors, a major must maintain at least an 85 average for all language courses taken. So far, which student qualifies?
The American Bar Association conducted a survey in 1986 showed that the average income of lawyers in 1986 was $ 120,000. An investigator took a sample of 64 lawyers in 1990, produced a median income of $ 140,000 with a standard deviation of $ 24.5..
You are running a chi-squared test. If you have 5 groups with 3 characteristics each, what would your critical value be with an alpha of .25? a . Between 0 and 3.0
a) Identify the claim, and write the claim, the null hypothesis, and the alternative hypothesis in symbolic form. b) Determine if the test is two-tailed, right-tailed, or left-tailed, and determine the value of the test statistic.
Distributed with a mean of $150 and standard deviation of $25. About how many of the students spend less than $100 on books?
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