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1. If a distribution appears to be bell-shaped and symmetric about its mean, can we assume that the probability of being within one standard deviation of the mean is .68?
2. Can two distributions differ by a large amount yet have equal means and variances?
The remainder are defective. If 4 of the products are randomly selected, find the probability that all of them are acceptable.
Find a 95% confidence interval for the percentage of girls and women in Taiwan who had antibodies at that time.
Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 8 at the 0.05 level of significance?
in a past election the voter turnout was 51. in a survey 843 subjects were asked if they voted in the election. find
An experiment studied the effects of starch source, starch concentration, and temperature on the strength of gels. This experiment was completely randomized with sixteen units.
in a recent study of 35 ninth-grade students the mean number of hours per week that they played video games was 16.6.
a single strain gage has a nominal resistance of 120 ohm. for a quarter bridge with 120 ohm fixed resistors the voltage
The data in Table 8.11 were considered by Gentry and Pike (1970) in their study of the relationship between the mean rate of return over the period 1956 through 1969 and the 1969 value of common stock portfolios for 32 life insurance companies.
An official of the Iowa department of Highways wants to compare the useful life, in months, of two brands of paint used for striping roads. The mean number of months Cooper Paint lasted was 36.2
Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error.
the study found 87 per cent of 1500 australians surveyed would support colour-coding on packaged food to indicate
You would like to take an advantage of the higher yield investment but have only $500 available. What is the maximum rate of return that you would pay to borrow the $200 need to take advantage of the high yield investment?
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