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1. I hypothesized that girls in my class have the same blood pressure levels as boys. The probability value for my null hypothesis was 0.15. So I conclude that the blood pressures of the girls were higher than boys'. Which kind of mistake did I make? a. Type I errorb. Type II errorc. Type I and Type II errord. I did not make any mistake 2. If a statistical test result is not significant at the 0.05 level, then we can conclude: a. It is not significant at 0.10 levelb. It must be significant at 0.01 levelc. It must be significant above 0.05 leveld. It is not significant at 0.01 level 3. A researcher posed a null hypothesis that there was no significant difference between boys and girls on a standard memory test. She randomly sampled 100 girls and 100 boys in a community and gave them the standard memory test. The mean score for girls was 70 and the standard deviation of mean was 5.0. The mean score for boys was 65 and the standard deviation of mean was 5.0. What is the standard error of the difference in means? 4. If power is big, you can assume: a. The significance level set by the researcher must be highb. We increase the probability of type I errorc. Your study result will be more likely to be inconclusived. The difference between the means is more likely to be detected 5. If the probability that you will correctly reject a false null hypothesis is 0.80 at 0.05 significance level. Therefore, α is__ and β is__. a. 0.05, 0.80b. 0.05, 0.20 c. 0.95, 0.20d. 0.95, 0.80 6. The population has a mean of 678 and the population standard deviation is known to be 58.3. Use a 0.05 level of significance to test the claim that the sample scores listed below came from the population. Identify hypotheses, test statistic, P-value or critical value, conclusion about the null, and final conclusion that addresses the original claim. 714 751 664 789 818 779 698 836 753 834 693 802 7. I am looking to move to either Mississippi or Arkansas, depending on the cost of housing. Below are the costs (in thousands, hypothetically) of 12 houses in each location based upon a simple random selection: Mississippi: 155 142 149 130 151 163 151 142 156 133 138 161Arkansas: 133 140 142 131 134 129 128 140 140 140 137 143 Use a 0.05 significance level to test the claim that the mean cost of houses in Mississippi is greater than the mean cost in Arkansas. Be sure to give the hypotheses, the test statistic with a p-value, and a conclusion.
The acceptance rate for applicants with similar qualifications is 30% for University X and 55% for University Y. What is the probability that Jim will be accepted by at least one of the two universities?
actions to improve the repair time of equipment used to produce electronic components were taken two years ago. the
Suppose it has been determined that the average number of customers waiting for service is 1.929. There are two servers. Determine:
If 20 voters are selected at random, and X is the number of voters which support this referendum, determine the mean and variance of X.
How large a sample should she take to estimate the percentage with a margin of error of no more than 4%, with 90% confidence?
What is the probability that the percentage in the sample will deviate from the population percentage by no more than 7 percentage points?
Research question : At α = . 01, is degree of certainty independent of credits earned?
Determine the approximate probability that in random sample of 1000 individuals who have purchased fries at McDonald's.
This fits the form of a binomial experiment situation. Develop a 95% confidence statement. Show all of the steps. How do you do this?
The actual weight of soap powder in a box has a normal distribution with a mean of 33 oz. and a standard deviation of 0.8 oz. What proportion of packets are underweight.
Human heights are known to be normally distributed. Men have a mean height of 70 inches and females a mean height of 64 inches. Both have a standard deviation of 3 inches. What is the probability that a randomly selected female is above 70 inches..
two t-shirt printing factories produce t-shirts for a local sports team. factory a produces 60 of the shirts and
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