. Based on sample mean of diabetic subject minus that of normal, 97.5% of all possible differences are larger than 13.7 12.9
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- What is the z-score of x = 75, if it is 2.8 standard deviations to the left of the mean? Answer to the nearest tenth.A sample of N = 9 individuals participates in a repeated measures study that produces a sample mean difference of X = 4.25 with SS = 128 for the difference scores. Is this mean difference large enough to be considered a real positive effect?Suppose that IQ scores have a bell shaped distribution with a mean up 104 and a standard deviation of 17. Using the empirical rule, what percentage of accused scores are between 70 and 138?
- Find the mean of Binomial variable with number of trials n=5 and p=0.8Suppose that blood chlorine concentration (mmol/L) has a normal distribution with mean=98 and standard deviation=7. For a sample of n=40, what is the corresponding mean and standard deviation of the sampling distribution?2. On a standardized test, Sara had a score of 81, which was exactly 2 standard deviations below the mean. If the standard deviation for the test is 3, what is the mean score for the test?
- A sample from a Normal population of n=6 observations yields an Xbar=100 and an s=20. What is the 90% CI for the mean?A sample of N = 9 individuals participates in a repeated measures study that produces a sample mean difference of X = 4.25 with SS = 128 for the difference scores. Is this mean difference large enough to be considered a significant increase?In the US, the average one-way commuting time is 26.4 minutes. Is this different in Atlanta? One survey of 35 Atlanta commuters found an average one-way commuting time of 30.7 minutes. (a) The test statistic is 1.1846. What is the meaning of this test statistic? The average error between different sample results and the hypothesized mean is 1.1846.The current sample result is 1.1846 standard errors above the hypothesized mean. The maximum error between different sample results and the hypothesized mean is 1.1846. (b) Based on the test statistic of 1.1846, what is the p-value to test if the average commuting time in Atlanta is different than the rest of the US? (4 decimals.) (c) On the basis of the above p-value, what can be said regarding a 95% confidence interval for the true average commuting time? The interval contain the value 26.4, because this value . (d) Suppose the sample size was increased to 120 Atlanta commuters, with other values remaining the same. How would…
- The Nero Match Company sells matchboxes that are supposed to have an average of 40 matches per box, with a = 10. A random sample of 92 matchboxes shows the average number of matches per box to be 42.8. Using a 1% level of significance, can you say that the average number of matches per box is more than 40? What are we testing in this problem? O single proportionWhat is the z score for 20 if mean =18 and stadnard deviation =0.5