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the average drying time of a manufacturers paint is 20 minutes investigating the effectiveness of a modification in the
a city police department is considering replacing the tires on its cars with a new brand tires if mu1nbspis the average
a botanist wishes to test the null hypothesis that the average diameter of the flowers of a particular plant is 96 cm
an education specialist is considering the use of instructional material on compact discs for a special class of
suppose that we want to test the null hypothesis that an antipollution device for cars is effectivea explain under what
a biologist wants to test the null hypothesis that the mean wingspan of a certain kind of insect is 123 mm against the
an employee of a bank wants to test the null hypothesis that on the average the bank cashes 10 bad checks per day
rework example 3 withexample 3with reference to example 2 determine the minimum sample size needed to test the null
suppose that we want to test the null hypothesis that a certain kind of tire will last on the average 35000 miles
a single observation is to be used to test the null hypothesis that the mean waiting time between tremors recorded at a
a random sample of size 64 is to be used to test the null hypothesis that for a certain age group the mean score on an
the sum of the values obtained in a random sample of size n 5 is to be used to test the null hypothesis that on the
verify the statement in section 5 that 57 heads and 43 tails in 100 flips of a coin do not enable us to reject the null
to compare the variations in weight of four breeds of dogs researchers took independent random samples of sizes n1nbsp
the times to failure of certain electronic components in accelerate environment tests are 15 28 3 12 42 19 20 2 25 30
with reference to exercise 4 find the required size of the samples when sigma1nbsp 9 sigma2nbsp 13 delta 80 delta 86
making use of the fact that the chi-square distribution can be approximated with a normal distribution when nu the
with reference to exercise 9 use table ii of statistical tables to find values corresponding to k0025nbspand k0025to
show that the square of the expression for z in exercise 12 equals so that the two tests are actually equivalent when
show that the rule in section 7 for calculating the expected cell frequencies applies also when we test the null
use the formula of exercise 16 to recalculate chi2nbspfor example 10exercise 16show that the following computing
with reference to example 1 verify that the p-value corresponding to the observed value of the test statistic is
with reference to example 3 use suitable statistical software to find the p-value that corresponds to t -049 where t
test at the 005 level of significance whether the mean of a random sample of size n 16 is significantly less than 10
rework exercise 25 basing the decision on the p-value corresponding to the observed value of the test statisticexercise