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Prior to a statewide senate election, three polls are conducted concerning a particular candidate's popularity. In the first poll, 750 of 1500 voters favor the candidate. In the second poll, 1285 of 2520 favor the candidate. In the third poll, 1795 of 3500 voters favor the candidate. Find 95% confidence intervals for the proportion of voters in favor of the candidate for all three.
a) The 95% confidence interval for the first poll is ___<p < ___.
b) The 95% confidence interval for the second poll is ___<p < ___.
c) The 95% confidence interval for the third poll is ___<p < ___.
d) Does the confident interval includes values of les or more than 0.5?_____
The critical F value with 6 numerator and 60 denominator degrees of freedom at α = .05 is:
Suppose a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 5 credit hour courses
Explain whether the authors used a population or a sample. Explain how this could have affected the results. If a sample was used, was it representative of the entire population? Why or why not?
A 2007 study reported in Science magazine stated that fifth-grade teachers scored a mean of 3.4 (out of 7) points for "providing evaluative feedback to students on their work." Assume that the sample size was 36 and the sample standard deviation w..
Probability values based on normal distribution - old exit exam followed a normal distribution
What is the value of the population mean? What is the best estimate of the value?
Which sessions, morning or afternoon, had more stable or uniform attendance over three-day period? Describe by using the suitable calculation for each data set and compare two calculations .
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
What happens to the probability of getting exactly 50% heads?
Carry out the test for the variance of girls score is not significantly less than the given data.
Design an imaginary study or discuss an actual study you've read about that has an experimental or quasi-experimental design that used or would use t-tests or ANOVAs in the data analysis.
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline.
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