A group of students consisting of 20 males and 20 females were selected to participate in a research study.  If the students were selected using random sampling, what is the probability of picking a female student?

An internet company conducts a global consumer survey to help multinational companies understand different consumer attitudes throughout the world. Within 30 countries, the researchers interview 1000 people aged 13-65. Their samples are designed so that they get 500 males and 500 females in each country. Complete parts a and b below a) Are they using a simple random sample? Explain. O A. No. They are using a census rather than a simple random sample. O B. Yes. It is likely that 500 males and 500 females from every country were interviewed by random chance. O C. No. It would be nearly impossible to get exactly 500 males and 500 females from every country by random chance. O D. Yes. The population is split into representative clusters; therefore, it is a simple random sample. b) What kind of design do you think they are using? O A. A multistage sample, which uses a variety of sampling methods together. O B. This design is a cluster sampling because the population is split into…

Identify the kind of sample that is described. An electronics store polls 300 customers who bought computers at the store within the past two years about high-speed Internet rates. The sample consisted of 150 randomly selected Mac users and 150 randomly selecțed PC users. The sample is a (Choose one) v sample. convenience simple random cluster voluntary response stratified systematic

In a city, according to a 1990 demographic report based on the census result, the average daily spending onfood per person is $75.In 2020, a random sample of 28 persons in the same city is selected and the daily spending ($) on food foreach interviewee is recorded as follow:55.0 59.5 62.5 65.5 68.5 69.0 70.0 70.0 82.0 82.583.5 85.0 86.0 86.5 86.5 87.0 87.0 87.0 89.0 92.593.0 94.5 94.5 96.0 98.0 102.5 108.5 110.5(a) Find the point estimate for the population mean daily spending on food per person in year 2020.(b) It is assumed that the spending is normally distributed. Construct a 90% confidence interval estimatefor the population mean daily spending on food per person in year 2020.(c) Is there sufficient evidence to conclude that the population mean daily spending on food per person in2020 is higher than 1990? Test at 1% level of significance. (State clearly the null hypothesis,alternatively hypothesis, rejection region, test statistics and conclusion.)