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Suppose that the population of heights of female college students is approximately normally distributed with the mean m of 67.16 inches and standard deviation s of 4.82 inches.
Write down a correct null and alternative hypothesis for testing the claim that the mean life of a battery for a cell phone is at least 115 hour
A researcher claims that average age of people who purchase theatre tickets is 50. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 8. At a = 0.01 is
Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decima
Suppose X1,X2,....,Xn are independent random variables with uniform distribution on (0,1). Define X=max(X1,X2,...,Xn)
An object is in simple harmonic motion. Find out an equation for motion given that the frequency is 4/π and at time t = 0, y = 0, and y' = 8. Determine the equation of motion?
An object is in simple harmonic motion. Find an equation for the motion given that the period is π/4 and at time t = 0, y = 1, and y' = 8. What is the equation of motion?
Would the correlation between x and y in the table above be positive or negative? Find the missing value of y in the table.
In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. Assume that we want 96% confidence that the error is no more than 4 pe
A soft-drink vending machine is set so that amount of drink dispensed is normal random variable with mean of 200 milliliters and standard deviation of 15 milliliters. Determine the probability that
The weights of packets of cookies produced by the certain manufacturer approximately follow the normal distribution with mean of 202 grams and standard deviation of 3 grams.
A teacher is interested in comparing the effects of three different types of rehearsal methods (Rote rehearsal, Imagery, and Story) on number of words recalled. Participants are randomly assigned in
Each participant's difference score (= anger score after the treatment minus (-) anger score before the treatment) is shown in following table. The three therapists in this experiment have equal edu
Determine the mean and standard deviation of the sampling distribution of the sample mean? Determine the probability that mean for the sample is between 16.5 and 19.2?
A survey of 90 recently delivered woman enrolled in medicaid determined that 28 of them had a history of postpartum infection. Test the null hypothesis that the population mean for medicaid enrolled
Use the given degree of confidence and sample data to construct a confidence interval for the population mean, µ. Assume that the population has a normal distribution.
Determine the sample space S (list sample points). Describe a non-trivial random variable (x) on S. Determine the probability function of x? Estimate the cumulative distribution function of x?
How large of the sample of Sharks should be employed in order to obtain the average miles per gallon to be employed in the advertisements? Note: The standard deviation (?) can be estimated as the r
Make hypotheses that can be employed to test whether the population proportion of those who will employ the coupons is sufficient to go national.
State the null and alternative hypotheses assuming the intent of the researcher is to determine states that differ from the 70% reported by the National Center for Health Statistics.
State the null and alternative hypotheses assuming the intent of the researcher is to identify states that differ from the 70% reported by the National Center for Health Statistics.
A safety officer wants to prove that ? = the average speed of cars driven by a school is less than 25 mph. Suppose that a random sample of 14 cars shows an average speed of 24.0 mph, with a sample s
A random sample of 10 men who were married by age 30 showed average age at marriage of 22.2, with sample standard deviation of 1.9 years. Suppose that the age at which this population of men gets ma
The p-value for a one-sided test for a mean was 0.04. The p-value for the corresponding two-sided test would be:
Answer each of the following (show all work and state the final answer to at least two decimal places.): Find out the 90% confidence interval of the mean score for all 140 golfers.