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An increase in the rate of consumer savings frequently is tied to a lack of confidence in the economy and is said to be an indicator of a recessional tendency in the economy. A random sampling of n = 200 savings accounts in a local community showed the mean increase in savings account values to be 7.2% over the past 12 months, with standard deviation 5.6%. Estimate the mean percentage increase in savings account values over the past 12 months for depositors in the community. Place a bound on your error of estimation.
The mean diastolic blood pressure for random sample of 90 people was 92 millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be 12 millimeters of mercury
What is the probability density function for this uniform distribution?
a blood test indicates the presence of a particulat disease 95 of the time when the disease is actually present. the
The BMW that she wants sells for $37,220, while the Mitsubishi sells for $28,200. She can afford either car. Which car will she buy in order to maximize her utility?
suppose that we want to estimate the proportion of recipes in the better homes and gardens new cook book that do not
Find out the expected winnings for a person who buys one ticket.
the average flight from point a to point b takes 100 minutes with a standard deviation of 10 minutes.a. what is the
Could the interval be used to estimate the mean amount of time a 9-year-old American spends eating & drinking each day. Explain.
in a large-sample test of hypothesis to compare the two means the test statistic was computed to be z 1.22. compute
Assume that you have selected 10 students enrolled at your college and have collected data for these three variables:
a common method for detecting a signal in the prescence of noise is to establish a threshold level and compare the
Find out the test statistic P-value, and critical value, and state the final conclusion. The mean IQ score of statistic professors is less than 120. Sample data: n = 46. Suppose that = 17, and the significance level is = 0.05.
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