solve the following and mark the correct statement.
In which case could the sampling distribution of sample means
be expected to be normally distributed?
A) The parent population is skewed, the sample size is
B) The parent population is jumbled, the sample size is
C) The parent population is jumbled, the sample size is
D) The parent population is uniform, the sample size is
Recent English test scores were approximately normally
distributed with a mean of 60 and a standard deviation of 9. A
random sample of 144 scores was taken. Using a TI‐84, what is the
probability the sample mean is between 58.5 and 61.5?
A) Normalcdf(58.5, 61.5, 60, 0.75)
B) Normalcdf(58.5, 61.5, 60, 9)
C) Normalcdf(58.5, 61.5, 144, 0.75)
D) Normalcdf(58.5, 61.5, 144, 9)
A sample of 625 vehicles in Qatar was taken. The mean age was
3.5 years with a standard deviation of 0.5 years. What is the point
estimate for the population mean?
Which is an example of cluster sampling?
A) 1% of the population of each school in Qatar is
B) A random sample of schools in Qatar is selected, then 5% of
population is sampled.
C) A student in a school is randomly selected, then every
fifth student is selected.
D) The names of all students in a school are placed in a bin,
then 50 are randomly
Which is an example of biased sampling?
A) The dean decides to start with the second student on the
enrolment, and then picks every fifth student.
B) The dean places the name of each faculty in a bag, then
randomly selects three.
C) The dean uses a random number generator to select 5% of the
D) The dean uses a random number generator to select one
student from the
enrolment, and starting from there selects every fourth
Yousif plans to take a sample of 5 students from his
statistics class of 20. How many different samples are
C) 15 504
D) 1 860 480