According to previous studies, 10% of the U.S. population is left-handed. Not knowing this, a high school student claims that the percentage of left-handed people in the U.S. is 12%. The student is going to take a random sample of 900 people in the U.S. to try to gather evidence to support the claim. Let p be the proportion of left-handed people in the sample. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p. 0.12 (b) Find the standard deviation of p. 0 D (c) Compute an approximation for P(p≤0.12), which is the probability that there will be 12% or fewer left-handed people in the sample. Round your answer to four decimal places. Π 5

Read the study below carefully.  Then answer the questions that follow by typing in the letter of the correct response.   Rhianna hears that watching ASMR videos on YouTube can help with insomnia.  She conducts a sleep study on 60 people who have difficulty sleeping by asking a simple random sample of 30 participants to watch at least 20 minutes of ASMR videos prior to sleeping and the remaining 30 participants to attempt to sleep without watching any videos.  During the study, the subjects are connected to an EEG machine, which is used to measure brain activity.  Rhianna analyzes the EEG results and concludes that those who watched the ASMR videos experienced a better quality of sleep than those who did not.   i.   Identify the treatments in Rhianna’s study. A.   being connected to an EEG machine B.   experiencing difficulty sleeping C.   watching at least 20 minutes of ASMR videos D.   watching at least 20 minutes of non-ASMR videos E.    watching no videos prior to sleep F.    all…

What is the proportion of the blood type O?

The heights (in centimeters) of some randomly selected Men's World Cup soccer players from both Europe and the U.S. are given below. Europe 169 170 171 175 175 175 178 180 181 182 184 185 185 187 189 United States 167 168 169 173 176 176 178 180 180 181 183 183 186 187 187 Is there a difference between the heights of European and American soccer players? What is the test statistic for this test? 0.7399 0.3352 0.3700 0.6648 0.2601