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A researcher wishes to estimate the proportion of adults who have high speed internet access. What size sample should be obtained if she wishes the estimate to be within 0.04 with 99% confidence if
In an experiment, 50 individuals were told that they had just purchased a ticket to a concert and 50 were told that they had just purchased a personal digital assistant (PDA). The participants were
Use the given degree of confidence and sample data to construct a confidence interval for the population mean. Assume that the population has a normal distrobution. n=10, x-=8.1, s=4.8, 95% confiden
The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 70 inches, and a standard deviation of 10 inches. What is the probablility that the mean annual show
Find the critical value. Assume that the test is two-tailed and that n denotes the number of pairs of data. n = 60, = 0.05
State the null and alternate hypotheses, state whether the null hypothesis should be rejected or not rejected and your reason for that conclusion, state the meaning of that conclusion specifically i
A random sample of 400 business school graduates showed that 75 had gone to graduate school while in a random sample of 500 non-business graduates, 137 had gone on to graduate school. Based on these
Which of the following methods could lead to stronger evidence for the outcome of a nonparametric test?
Which of the following nonparametric tests reaches a conclusion equivalent to the Mann-Whitney U test?
Find the indicated IQ score. The graph to the right depicts IQ score of adults and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The graph depicts 0.7 to t
Find the indicated IQ score. The graph to the right depicts IQ score of adults and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The graph depicts .07 to t
Generate numerical and graphical descriptive statistics for each variable. Which tests is this asking for? (there are 4 variables: age, sex, agegroup, SBP1).
The data below are the temperatures on randomly chosen days during a summer class and the number of absences on those days. Construct a 95% confidence interval about the slope of the true least-squa
Suppose that we will randomly select a sample of four measurements from a larger population of measurements. The sampling distribution of the sample mean is the probability distribution of a populat
In a cheese factory, 5.0 kg blocs of cheese are cut manually. For a large number of blocks, the standard deviation of the cutting process is measured and found to be 0.11 kg. The measurement was don
Supposed that battery failure time, measured in hours, has a probability density function give by f(x)=2/(x+1)3. Compute the probability that battery lasts longer than 5 hrs?
A researcher randomly selects 15 bulbs for testing. The sampled bulbs last an average of 290 days, with a standard deviation of 50 days. If the CEO's claim were true, what is the probability that 15
List the uncertainties and categorize them as systematic or random. Calculate the uncertainty in a measurement of 3.20 kg by this instrument.
A single strain gage has a nominal resistance of 120 ohm. For a quarter bridge with 120 ohm fixed resistors, the voltage output is 1.658 mV with a strain of 1000- µstrain for a supply voltage
The data set of the diameters of the metal cylinders manufactured an automatic machine has n=29, mean of x=49.92 and, std. s = 0.16. Expected diameter of metal cylinder is µ = 50 Is there any