Reports say that the mean birth weight of babies of European heritage is 3.5 kg. Marta wants to perform a significance test to see if this holds true in her nation. She takes a random sample of babies and observes a mean birth weight of xˉ=3.43 kg. Here's Marta's null hypothesis:H0 : The mean birth weight in this nation is...What is an appropriate way for Marta to finish her null hypothesis statement?a. ... not equal to 3.43 kg. b. ...equal to 3.43 kg. c. ... equal to 3.5 kg. d. ... equal to 3.5 kg.

There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?