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(a) College STAT Club wanted to estimate the study hours of STAT 200 students. One STAT 200 section was randomly selected and all students from that section were asked to fill out the questionnaire. This type of sampling is called:
(i) cluster
(ii) convenience
(iii) systematic
(iv) stratified
(b) A study was conducted at a local college to analyze the trend of average GPA of all students graduated from the college. According to the Registrar, the average GPA for students with economics major from the class of 2016 is 3.5. The value 3.5 is a
(i) statistic
(ii) parameter
(iii) cannot be determined
(c) The hotel ratings are usually on a scale from 0 star to 5 stars. The level of this measurement is
(i) interval
(ii) nominal
(iii) ordinal
(iv) ratio
(d) 500 students took a chemistry test. You sampled 100 students to estimate the average score and the standard deviation. How many degrees of freedom were there in the estimation of the standard deviation?
(i) 99 (ii) 100
(iii) 499
(iv) 500
(e) You choose an alpha level of 0.01 and then analyze your data. What is the probability that you will make a Type I error given that the null hypothesis is true? (i) 0.025 (ii) 0.05 (iii) 0.01 (iv) 0.10
Which of the following measurements do you think are likely to have a normal distribution: heights of college men, incomes of 40-year-old women, pulse rates of college athletes? Explain your reasoning for each variable.
Estimate the population standard deviation - Construct the X bar and s chart and Determine a 95% confidence interval for the population Cp
A) At the best, how much is the player's expected earning? Is it above or below $1? B) To make the lottery a fair bet, how much should the winning bonus be ? (i.e. find X, such that if the winning bonus is $X. the player's expected earning equals ..
Explain how the Central Limit Theorem can help you convince your boss that while you can't get rid of sampling error the results from your statistical work (that is based on sampling) can still be useful.
a) What's the expected number of smokers? b) What's the standard deviation of the number of smokers?
If the analyst finds evidence that the boast of dealership A is correct. What will be your critical value? What is the value of the test statistic? the boast of dealership A is correct?
1. give examples of two variables that are positively correlated and two that are negatively correlated.2. what
They would like the margin of error of the 95% confidence interval for the proportion to be 0.05 or less. Use the guessed value p = 0.25 to find the required sample size.
Although we have not emphasized it, the paired t-test can be used to test hypotheses in which the null value is something other than 0.
What sample size must be taken to estimate the average gas price in houston with 99% confidence and max error of 5 cents? Assume population standard deviation of gas prices is 60 cents.
As a sample of radioactive atoms decays, the number of atoms steadily diminishes and the sample's radioactivity decreases in proportion.
Determine the probability that sample mean is between 7.5 and 8 minutes?
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