Teacher Joy conducted a census in her class, and she found out that the average time that her students devote to studying is 2.25 hours, their average height is 147 cm, and a random sample of 10 students got an average of 87% in their latest quiz.Which of the given numbers is a sample?*1 point10 Students2.25 Hours147 cm87%

For an upcoming government project, you are required to find the average height of the students in Class VIII of a given school. Instead of asking every student, you took a few students as your sample and noted their heights in the table given below. Roll Number Height8012 121.92 cm8045 133.21 cm8053 141.34 cm8099 126.23 cm8125 175.74 cmQuestion 2/3MandatorySamplingWhat is the mean of the sample?133.21139.69146.76141.34

Sir Gary randomly chose five students from his class of 40 and found out that these five students devote an average of 1.6 hours daily for play and recreational activities.Which of the given numbers is a statistic?*1 pointPopulation sizeAverage time spent asleepSample sizeAverage length of playing time

Diane and Melissa want to find the mean amount of time it takes students in their class to travel to school. So they each randomly select students in their class and ask for the times.The results are shown below (in minutes). Use the data to answer the questions.Diane's sample:7, 5, 20, 12, 16, 6, 8Melissa's sample:13, 8, 12, 20, 7(a) What is the sample size for Diane's sample?(b) What is the sample size for Melissa's sample?(c) Suppose you had to choose one sample to estimate the mean.Which sample is more likely to give a good estimate of the mean?Diane's sampleMelissa's sampleWhy?It has the smaller mean.It has the larger mean.It has the smaller sample size.It has the larger sample size.

A simple random sample of seven (7) students is selected, and the students are asked how much time they spent studying for their University subjects (combined) outside class times. From past experience, it is known that these times (in hours) are distributed normally.The times (in hours) for the sample of students are as follows:2.3 7.2 4.5 12.5 6.6 2.5 5.5Based on these results, a confidence interval estimate for the population mean is found to be 5.9 ± 2.6.The level of confidence the researcher has used is closest to:-Group of answer choices95%90%97.5%99%

A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of twenty three hours, what is the required sample size if the error should be less than three hours with a 95% level of confidence?