Activity 1 Write the letter of the correct answer before the number.
1. Which of the following is not true about the Student's f distribution
a) It has more area in the tails and less in the center than does the normal distribution.
b) It is used to construct confidence intervals for the population mean when the population standard deviation is known.
c} It is bell-shaped and symmetrical.
d) As the number of degrees of freedom increases the distribution approaches the normal distribution
2. The t distribution
a) assumes the population is normally distributed.
b) approaches the normal distribution as the sample size increases
c) has more area in the tails than does the normal distribution.
d) All of the above.
3. A major department store chain is interested in estimating the average amount its redit card customers spent on their first visit to the choin's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: * = 2525 pesos and 52 = 20,000. Assuming the distribution of the amount spent on their first visit is approximately normal, what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for population mean (u) 2
a) Approximately normal with a mean of Php 2525
b) A standard normal distribution
c) At distribution with 15 degrees of freedom
d) Af distribution with 14 degrees of freedom
4. A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mail. Fifteen credit card accounts were randomly sampled and analyzed with the following results: * = 2525 pesos and 52 = 20.000. Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall.
a) 2525 pesos ± 454.5 peos
b) 2525 pesos ± 506 pesos
c) 2525 pesos ± 550 pesos
d) 2525 pesos ± 554 pesos
5. As an aid to the establishment of personnel requirements, the director of a hospital wishes to estimate the mean number of people who are admitted to the emergency room during a 24-hour period. The director randomly selects 64 different 24-hour periods and determines the number of admissions for each. For this sample, * =198 and 52 = 25. Which of the following assumptions is necessary in order for a confidence interval to be valida
a) The population sampled from has an approximate normal distribution
b) The population sampled from has an approximate i distribution
c) The mean of the sample equals the mean of the population
d) None of these assumptions are necessary.
(Help. I need this by tomorrow. I forgot to tell my previous one is also due tomorrow. So if you can, please help.)
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Answer:
Julianne saw a 3-dimensional figure that had 4 vertices and 6 edges. what figure could Julianne have seen?