Here are summary statistics for randomly selected weights of newborn​ girls: A) n=234​, x=28.4 ​hg, s=7.6 hg. Construct a confidence interval estimate of the mean. Use a 95​% confidence level.   B) Are these results very different from the confidence interval 27.2 hg<μ<30.6 hg with only 16 sample​ values, x=28.9 ​hg, and s=3.2 hg? What is the confidence interval for the population mean μ​?   C) Are the results between the two confidence intervals very similar?

During the nutrition research, the amount of consumed kilocalories per day was measured for 18 people - 10 women and 8 men. Results are as follows: Women: 2026, 1600, 1700, 1950, 1922, 1786, 1712, 1777, 2006, 1832; Men: 2170, 2557, 2384, 2427, 2334, 2228, 2161, 2459. Calculate a 90% confidence interval on the mean for women and men separately. Assume distribution to be normal. Round your answers to the nearest integer (e.g. 9876). Women: i Men: i

The mean potassium content of a popular sports drink is listed as 132 mg in a 32-oz bottle. Analysis of 24 bottles indicates a sample mean of 131.2 mg. (a) State the hypotheses for a two-tailed test of the claimed potassium content.. a. Ho: μ= 132 mg vs. H₁: b. He: ≤132 mg vs. H₁: c. He: ≥132 mg vs. H₁: Oa Ob Oc (b) Assuming a known standard deviation of 2.1 mg, calculate the z test statistic to test the manufacturer's claim. (Round your answer to 2 decimal places. A negative value should be indicated by a minus sign.) Test statistic 132 mg >132 mg <132 mg (c) At the 2 percent level of significance (a = .02) does the sample contradict the manufacturer's claim? Decision Rule: Reject Ho

Given below are the sodium contents in milligrams for seven brands of hot dogs rated as “very good” by Consumer Reports.  Find a 99.9% confidence interval for the true mean amount of sodium for “very good” hotdogs. ​​​​400     470​  350​ 365​ 270​ 550​ 530​

Here are summary statistics for randomly selected weights of newborn​ girls: n=217​, x=31.7hg, s=6.5hg. Construct a confidence interval estimate of the mean. Use a 98​% confidence level. Are these results very different from the confidence interval 29.6hg<μ<32.6hg with only 17 sample​ values, x=31.1​hg, and s=2.4​hg?   What is the confidence interval for the population mean μ​?   hg < μ < hg   ​(Round to one decimal place as​ needed.)

A. True or False? A researcher compares the BMI of two populations of individuals from different socioeconomic backgrounds and finds that the proportion of individuals considered obese and from a poor background is .37 (n = 112), and the proportion of individuals considered obese and from an affluent background is .27 (n = 87); a 95% confidence interval for the risk difference for obesity among members of the poor population compared to the affluent population is (-0.03, 0.23). B. Why is it true or false?

Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96