In what range would you expect to find the middle 95% of most head breadths? Between _________ and ____________. If you were to draw samples of size 57 from this population, in what range would you expect to find the middle 95% of most averages for the breadths of male heads in the sample? Between ______and _______.

The amount people pay for electric service varies quite a bit, but the mean monthly fee is $168 and the standard deviation is $34. The distribution is not Normal. Many people pay about $90 in rural areas of the country and about $150 in urban areas of the country, but some pay much more. A sample survey is designed to ask a simple random sample of 1,200 people how much they pay for electric services. Let X be the mean amount paid. Part A: What are the mean and standard deviation of the sample distribution of x? Show your work and justify your reasoning. Part B: What is the shape of the sampling distribution of X? Justify your answer. Part C: What is the probability that the average electric service paid by the sample of electric service customers will exceed $170? Show your work.

fill blanks.

Q.1 At the end of every school year, the state administers a reading test to a sample of 36 third graders. The school system has 20,000 third graders, half boys and half girls. The results from last year's test are shown in the table below. Stratum Boys Girls Mean score 80 70 Standard deviation 10.27 6.66 This year, the researchers plan to use a stratified sample, with one stratum consisting of boys and the other, girls. Use the results from last year to answer the following questions? . To maximize precision, how many sampled students should be boys and how many should be girls? . What is the mean reading achievement level in the population? Compute the confidence interval. . Find the margin of error.

Please answer those two questions, thanks

Which of the following statements is NOT correct about effects of scale changes for a data set? O a. When a constant of 3 is multiplied with every score value, the variance will increase by 9 Ob. When a constant of 3 is added to every score value, the variance will not change c. When a constant of 3 is multiplied with every score value, the standard deviation will increase by 3 d. When a constant of 3 is added to every score value, the standard deviation will increase by 3

Which of the following is an example of doing inferential statistics? You calculate the average grade on an exam in a class of 5th grade math students to see if they did better or worse than last year. You lookup the median and the standard deviation of the age for the U.S. population from U.S. Census data. You use a sample of homes in Rancho Cucamonga to draw a conclusion about the mean home price for all Rancho Cucamonga homes. You compare the distributions of scores for two Social Science 10 classes to see which class did better on the exam.

The lengths of pregnancies in a small rural village are normally distributed with a mean of 269 days and a standard deviation of 15 days.In what range would you expect to find the middle 50% of most pregnancies?Between  and .If you were to draw samples of size 56 from this population, in what range would you expect to find the middle 50% of most averages for the lengths of pregnancies in the sample?Between ______  and _______.

If you have a known value of 16, which of the following is the best average of your data to verify the known value? O 12.5 + 6.02 O 16 + 3.03 O 14.2 + 2.03 O 14.2 + 3.6

The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days and a standard deviation of 12 days.In what range would you expect to find the middle 95% of most pregnancies?Round to the nearest whole number.Between ______  and ______ .If you were to draw samples of size 51 from this population, in what range would you expect to find the middle 95% of most averages for the lengths of pregnancies in the sample? Round to 1 decimal place.Between _______ and _______ .