Hypotheses: H0:p=0.5H0:p=0.5 vs Ha:p≠0.5Ha:p≠⁢0.5; Sample data: p^=2840=0.70p^=2840=0.70 with n=40

nd the 30th and 98th percentile values cf a normal variable with Mean of 12_and Variance of 30 Anot This I NEED PARTBI b), Suppose we sample 3 items from this population. Find the variables that correspond to the central 85% Confident Interval range of the sum of these 3 samples.

Please see below. Note that I am only given one attempt at this and I believe that the answer I have may not be correct. In selecting the sample size to estimate the population proportion pp, if we have no knowledge of even the approximate value of the sample proportion p̂ p^, we:A. take two more samples and find the average of their p̂ p^B. let p̂ =0.95p^=0.95C. let p̂ =0.50p^=0.50D. take another sample and estimate p̂ p^ Under which of the following circumstances is it impossible to construct a confidence interval for the population mean?A. A normal population with a large sample and a known population variance.B. A normal population with a small sample and an unknown population variance.C. A non-normal population with a large sample and an unknown population variance.D. A non-normal population with a small sample and an unknown population variance.

For samples selected for population with a mean of 90 and a standard deviation of 30, what sample size is necessary to make the standard distance between the sample mean and the population mean equal to five points?

A population of N=10 scores has a mean of 200 and SS = 160.  Calculate:  the sum of X  sum of (X-mean) sum of X-mean sum of (X-mean)^2 mean^2 standard deviation variance

use the date form the second picture to answer question 3 please help me with question 3

Can i get help with this problem? the sample proportion denoted phat is given by the formula phat(p-hat)=x/n where x s the number of individuals with a specified characteristic in a sample of n individuals. 1.  find:  phat(p-hat_ if the students poll surveyed  1200 people that vacation during the summer and asked if they plan to work while on vacation.  Of those surveyed, 552 indicated that they plan to work on vacation.  Find the sample proportion of individuals polled that plan to work on vacation. So, Students estimates that from the value of phat(p-hat) found above that ____________ or ________ % of adults who vacation plan to work on vacation,

An excess of high values for the cases distributed on a graph results in a positive skew in the data?