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Construct a 98% confidence interval for the rate of effectiveness of the new drug for treating this type of infection.
The normal range for the MAO levels is between 5.5 and 8.5. How does the interval constructed in part 3a compare with the normal range? What conclusions can be drawn?
A random sample of size n = 30 is selected from this population. Approximate the probability that the mean number of tumours per fish is greater than 0.35.
Determine whether the evidence is enough to reject the salesperson's claim. Establish the Null and alternative hypothesis, and choose the right test statistics.
Do the data support the belief that the average household in the Pembroke area spends more than $45 in preparation for Halloween; use a significance level of .01.
Test the financial analyst's belief that the average rate charged by credit cards with monthly fees is less than 14%. Use a 5% significance level.
The sample mean is $68, with a sample standard deviation of $17. What is a 90% confidence interval for the mean monthly expenditure on gasoline per household in Slippery Rock?
The times are exponentially distributed with a service rate of 10 per hour. What is the probability that a truck requires more than 15 minutes to be checked.
Suppose that three wireless web users are selected at random. What is the probability that all of them use it primarily for e-mail?
The following table lists the bivariate distribution of X and Y. Find the marginal probability distribution of X. Compute the mean and variance of Y.
You are a researcher interested in addressing the question: does smiling cause mood to rise (i.e., become more positive)? Sketch between-participants, within-participants, and matched-participants.
What do you think? One way of reasoning here is: If Jack is just guessing how odd is it that he gets 18 or more correct out of 30?; i.e., obtain the probability that X ≥ 18.
If Chris does not have ESP and is just guessing, what is the value for p? What is the probability he gets more than 30 correct out of 40 trials?
Determine the probability that the home team would win 65% or more of its games in a simple random sample of 80 games.
A standard deviation of 18 mm Hg. Assume systolic blood pressure is normally distributed. Determine the 70th percentile of systolic blood pressure for this group.
The coefficient for the independent variable "average car gas mileage (mpg)," -70.50, describes. The relationship between energy consumption and average car gas mileage, controlling for GDP.
The probability that a parolee will commit a crime while on parole is 0.68. A parole officer is in charge of 8 parolees. What is the probability that at least 7 of them will commit a crime while on
Create and interpret a 99% confidence interval for the population standard deviation. Assume the distribution of gas prices in the area follows a normal distribution.
57 claimed that their co-workers were their biggest cause of stress at work. Construct a 90% confidence interval for p. Interpret the meaning of this interval.
Find a 95% confidence interval (nearest hour) for the mean life of the floodlights. Interpret this interval. How could the engineer increase the accuracy of the interval without changing the level of
Suppose the inspector is unhappy with the previous result and would like to resample. How many rolls should be sampled to estimate the mean tensile strength within 1.5 PSI with 95% confidence?
What would happen to the probability in part b if the sample size was increased to n = 100? Explain why this happens.
With probability 0.95, the error will not exceed 0.04. What sample size will ensure this, regardless of what sample proportion value occurs when they gather the sample?
Find a peer-reviewed article that reflects these circumstances, describe the research conducted (i.e., ANOVA) and discuss the results.
What if the researcher compared the adolescent boys before treatment and again after treating them for depression? What type of t-test would be most appropriate in this case, and why?