random samples

A random sample of the number of patients treated each day from hospitals in a state is shown. At α = 0.05, find the F test value and test the claim that the mean number of patients treated each day are the same in all parts of a state. => 2.99, not the same or 2.99, same ..

A random sample of the number of students accessing the internet during the working hours of three different schools is given. At α = 0.05, find the F test value and is there evidence to conclude a difference in means? => 0.19, all the means are same or 0.19, means are dif..

A random sample of books being sold in 3 different stores is shown. At α = 0.05, find the F test value and test the claim that the average number of books sold is the same. => 0.04, different or 3.55, same or 0.04, same or 3.55, different..

The mean life span of an electric bulb is 350 hours, with a standard deviation of 10 hours. A random sample 40 of a particular brand of electric bulbs is taken and found that their mean life span was 348 hours. State the null hypothesis( H o ) for the situation. => H o : The mea..

A school teacher estimated that 80% of the students can score grade A in the final test. He selected a random sample of 140 students after the final examination and observed that 115 students scored grade A. At α = 0.01, find the test value and comment on the teacher's est..

The university authorities wanted to estimate the average age of the students in their university by taking a random sample of 25 students. The standard deviation was found to be 3 years. Find the 95% confidence interval for the variance (σ 2 ) and standard deviation (&sig..

An automobile parts supplier wants to know how long car owners plan to keep their cars with them. A random sample of 20 car owners results in a standard deviation of 3.7 years. Find a 95% confidence interval for the variance and standard deviation. Assume that the variable is no..

Choose the incorrect statement(s). I. A statistic is a numeric descriptive measure of a population. II. The sampling error is the difference between the population value of interest and sample value. III. If the sample is randomly selected from the population..

A bag has red, blue and green balls. A coin is tossed and a ball is picked at random simultaneously. Find the sample space from the tree diagram. => (RH, HT, BH, BT, GH, GT) or (RH, RT, BH, BT, GH, GT) or (RH, RT, BG, BT, GH, GT) or (RH, RB, BH, BT, GH, GT)..

The students of Plant Study & Research identified a set of full grown banyan trees in a forest to find the average height of a banyan tree. Which of the following statement(s) is/are true? I. The set of full grown banyan trees from a forest represent the population for this study. II. The set of fu..