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Test the given problem using independent sample t -test.
A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent CAT scores and found the mean score for girls to be xbar1 = 25 and the mean score for boys to be xbar2 = 26. The standard deviation for the girls is s1 = 2.2 and for the boys the standard deviation is s2 = 3.4. Is the school district correct in assuming the girls are equal in performance to boys. They are 95% sure their assumption is correct.
Standard deviation was increased to 40, determine the overall effect on their society? Would this change be a good thing?
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
At the 0.05 level of significance, is there sufficient reason to believe that the integers are not being generated uniformly?
Determine the pairs which are significant according to LSD and what pairs are important according to Bonferroni?
Evaluate the result in part c with the decision using the expected value approach.
A scientist examined the effect of temperature and catalyst on the yield of a reaction. He ran the experiment at both 150° and 200°C with two types of catalyst.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
We have a deck of 52 playing cards. What is the probability of drawing?
The probability of the patient being chosen at random as having meningitis as only site of infection is?
In regression equation, the value of y-intercept indicates the value of Y when the value of X is zero.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
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