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Twitter users and news, Part I: A poll conducted in 2013 found that 52% of U.S. adult Twitter users get at least some news on Twitter (Pew, 2013). The standard error for this estimate was 2.4%, and a normal distribution may be used to model the sample proportion. Construct a 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter, and interpret the confidence interval in context.
(please round all percentages to 2 decimal places)
The 99% confidence interval is ( %, %) Interpret the meaning of your confidence interval:
An investigator writes, "Statistical tests are a powerful tool for deciding whether effects are large." Do you agree or disagree? Discuss briefly.
if a hypothesis test using a sample of n16 scores produces a t statistic of t2.15 then the correct decision is to
At the 5% level of significance, can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds?
In a large section of a statistics class, the points for the final exam are normally distributed with a mean of 72 and a standard deviation of 9. Find the lowest score on the final exam that would qualify a student for an A, a B and a C.
Given this Analysis of Variance information for three treatments each with six observations.with SST =1116, SSE=1068, SSTotal =2184. What is the mean square for treatments?
suppose we have three fair 6-sided die one colored green one colored black and one colored red. an experiment consists
if a basketball player is a 60 free throw shooter then on average how many free throws will he make in a game with six
What is the idea of "least squares"? What is the connection between "least squares" and linear regression?
Suppose the waiting time at a restaurant is normally distributed with a mean of 12 minutes and a standard deviation of 6 minutes.
Figure 19.2 shows track patterns of wolf packs, mapped in a census of a study region in the Gulkana River area of Alaska (Becker 1990). The number yk of wolves in each pack is given near each set of tracks.
A standard deviation of mg/dL. What is Mrs. Brown's cholesterol level? Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
question hallux abducto valgus call it havis a deformation of the big toe that often requires surgery. doctors used
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