Is this Observational or experiment?? Q1. A farmer tries 4 different nutrient mi

Question

Is this Observational or experiment??

Q1. A farmer tries 4 different nutrient mixtures on randomly selected groups of plants to determine which mixture yields more growth.

Q2. Calorie intakes for a cohort of scholarship athletes who play team sports are recorded and compared to those of athletes who play individual sports to see if there is a difference.

Is this parameter or statistics

Q1: Sample of 58 students the average number of hours worked per week is 40.0 hours.

Q2. all students at a college in NY 95% work at least part time.

Explanation / Answer

Solution :

Part a) We have to determine if the given situation is Observational or experiment.

Q1. A farmer tries 4 different nutrient mixtures on randomly selected groups of plants to determine which mixture yields more growth.

Answer : Since farmer applies 4 different nutrient mixtures on randomly selected groups of plants , So farmer is doing actual experiment on randomly selected groups of plants and determine which mixture yields more growth. Thus this is Experimental study.

Q2. Calorie intakes for a cohort of scholarship athletes who play team sports are recorded and compared to those of athletes who play individual sports to see if there is a difference.

Answer: Here we just recording the calorie intakes for a cohort of scholarship athletes who play team sports

and then we are comparing to those of athletes who play individual sports to see if there is a difference. So here we are just making an observation of calxorie intakes . Thus this is Observational study.

Part b) We have to determine if following is parameter or statistic.

Statistic is the quantitative or qualititaive characteristics of sample . For example sample mean , sample standard deviation, sample proportion etc.

Parameter is the quantitative or qualitative characteristics of the population . For example population mean , population standard deviation , population proportion etc.

Q1: Sample of 58 students the average number of hours worked per week is 40.0 hours.

Average number of hours worked per week is found by using sample of 58 students. So this is related to sample mean, hence this is Statistic.

Q2. all students at a college in NY 95% work at least part time.

All studnets at a college in NY is the population of students and we are given the proportion of students who work at least part time. So this is related to population proportion ,hence this is parameter.

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