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1. I read an article about a new drug which stated that "the incidence of side effects was similar to placebo, P-value > 0.05." I want to know if the results are significant at = 10%. With the information given,
A. I will reject the null hypothesis of no difference at 10%.B. I will not reject the null hypothesis of no difference at 10%.C. There is not enough information given.
2. I want to estimate the proportion of individuals in my area who think the public school system needs major overhauling. If I believe the proportion will be about 35%, how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%?
A. at least 30B. at least 1068C. at least 972
3. I want to conduct a poll to discover the proportion of individuals who believe that global warming is not going to be a problem. If I believe the proportion is about 80%, how many individuals will I need to sample to have a 90% confidence interval with a margin of error no more than 5%?
A. at least 174B. at least 246C. at least 271
Suppose the true population proportion is 68%. What is the probability of observing a sample proportion 64% or smaller.
Calculate and interpret the appropriate statistical test to determine the relationship between the following two variables. Use the five-step model of hypothesis testing to draw conclusions at the .05 level of significance
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone. What is the value of q-hat?
An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent.
Suppose that 20 students have registered for course this semester. Determine the probability that two or fewer will withdraw? Determine the probability that exactly four will withdraw?
Assume you want to estimate the population proportion,p, and the estimator for the mean proportion (p-hat)= 0.34, N = 6000, and n = 1300. Find an approximate 95% confidence interval for p.
Given that the landowner pays for the soundings test and the test indicates that gas is present, what is the landowner's revised estimate of the probability of finding gas in this site?
Determine the probability that a single light bulb lasts over 120 hours. (d) Could you use the CLT to approximate the distribution of the total lifetime of these bulbs?
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities:
A sustained long-term change in the level of the variable that is being forecasted per unit of time is: (A trend, A time series, Seasonality or A change due to business cycles)
Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class. Compare the values and explain what can be concluded based on the numbers.
The intelligence Quotient test scores normally distributed with a mean of 100 and a standard deviation of 15.
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