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A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis?
1. σ = 5 and n = 25
2. σ = 5 and n = 50
3. σ = 10 and n = 25
4. σ = 10 and n = 50
Find out the probability that: (a) The amount requested is between $65,000 or more?
Explain why random samples are preferred to nonrandom samples.
Election poll reported that applicant had n approval rating 31% with margin of error E of 4%. Create a confidence interval for proportion of adults who approved of applicant.
Use the least-squares method to compute the regression of coefficients b0 and b1.
Use normal disrtibution of fish lengths for which the mean is 8 inches and the standard deviation is 5 inches. Assume the variable x is normally distributed.
Below, explicitly state slope of your trend line and describe what value of slope signifies in terms of this context.
Determine the probability in big class that both sections are covered? Only one section? Neither section? Determine the expected number of sections covered?
Construct a 95% confidence interval for the proportion of people disagreeing with the statement.
Determine and plot the probability mass function and probability distribution function of the contract award amount (in millions of dollars).
A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see that group has better grades.
A sample of 100 widgets from the Acme production line shows that the average lifespan of these parts is 900 hours. The standard deviation of production has been 200 hours historically and is known to be normally distributed.
Using a normal distribution with a mean of 1118 and a standard deviation of 52 for the weights of steers, what percent of steers weigh over 1250 pounds, under 1100 pounds, between 1000 and 1150 pounds.
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