QUESTION 1 1 points Save Answer Consider a population consisting of the measurements 4 and 3 with a probability distribution shown below. QUESTION 2 1 points Save Answer Consider a population consisting of the measurements 4 and B with a probability distribution shown below. What is the mean ofx? QUESTION 3 1 points Save Answer Consider a population consisting of the measurements 4 and 8 with a probability distribution shown below. X 4 8 P(x) 0.4 0.6 What is the standard deviation of X? O A. 44.8 O B. 6.0 O C. 1.96 O D. 6.4 QUESTION 4 1 points Save Answer Let Z be a standard normal variable. Find a such that P(Z > a ) = 0.95. O A. a = -1.645 O B. a = 1.960 O C. a = 2.326 O D.a = 1.645QUE) I IUN 3 The shape of the distribution of the time required to get an oil change is unknown. However, records indicate the mean time for an oil change is 12 minutes. and the standard deviation is 3.6 minutes. To compute probabilities regarding the sample mean, which one of the following is true? If: A. The normal model can be employed to approximate the probabilities if the sample size is at least 30. {3 B. The normal model can be employed if the sample size is 16. If; C. We can assume the distribution of the time required to get an oil change is bell-shaped as we wish. C; D.The normal model cannot be employed since the shape is unknown. QUESTION 6 The shape of the distribution of the time required to get an oil change is unknown. However, records indicate the mean time for an oil change is 12 minutes. and the standard deviation is 3.6 minutes. What are the mean and standard deviation of all possible sample means resulting from a random sample of 36 oil changes results? {'3 A. mean : 12; standard deviation 2 3.60 C; B. mean = 12;etandard deviation 2 0.60 C; C. mean = 12;etandard deviation 2 0.10 If: D.rnean : 2; standard deviation : 0.60 1 points 1 points Save Answer Save Answer QUESTION 7 1 points Save Answer The shape of the distribution of the time required to get an oil change is unknown. However, records indicate the mean time for an oil change is 12 minutes. and the standard deviation is 3.6 minutes. What is the probability that a random sample of 36 oil changes results in a sample mean time of less than 11 minutes? C A.0.952 C; B. 0.043 C; C. almost!) {3 0.0.391 QUESTION 3 1 points Save Answer The mean incubation time oi fertilized chicken eggs kept at 100.50F in a still-air incubator is 21 days. Suppose that the ineubation times are approximately normally distributed with a standard deviation of 1 day. Find the probability that a randomly selected fertilized chicken egg hatches in less than 20 days. C; A.0.1537 C; B. 0.8413 {3 05000 C; 0.0.3413 QUESTION 9 1 points Save Answer The mean incubation time of fertilized chicken eggs kept at 100.50F in a still-air incubator is 21 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 1 day. Find the probability that a randomly selected fertilized chicken egg hatches between 19 and 21 days. If) A.0.9500 C B. 0.3413 C; GOA-NZ {'3 0.0.1537 QUESTION 10 1 points Save Answer The mean incubation time of fertilized chicken eggs kept at 100.50F in a still-air incubator is 21 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 1 day. Determine the 17th percentile for incubation times of ferh'lized chicken eggs. QUESTION 11 1 points Save Answer The mean incubation time of fertilized chicken eggs kept at 100.5% in a still-air incubator is 21 days. Suppose that the iheubation times are approximately normally distributed with a standard deviation of 1 clay; Determine the incubation times that make up the middle 95% of fertilized chicken eggs. C; A. 20-22 days C; E. 1334223 days (3 C. 19-23 days C; D. 13-24 days QUESTION 12 1 points Save Answer A random sample of size n is sampled from a population with a mean of F and a standard deviation of (L Then, the mean and standard deviation of the sampling distribution of the sample mean are p and a, respectively, regardless of the population distribution. This statement is _. \":3 True C; False QUESTION 13 1 points Save Answer Let Z be a standard normal variable. Which one of the following is NOT correct? O A. P(Z 1) O B. P(0 - 1) QUESTION 14 1 points Save Answer The Z-score representing the first quartile of the standard normal distribution is O A. 0.67 O B. 1.28 O C. -1.28 O D.-0.67 QUESTION 15 1 points Save Answer1 points Save Answer The number of crimes committed in a day follows a distribution with a mean of 4.1 crimes per day and a standard deviation of 4 crimes per day. A random sample of 16 days was observed, and the sample mean number of crimes for the sample was calculated. Describe the sampling distribution of the sample mean. O A. approximately normal with mean=4.1 and standard deviation = 1 O B. approximately normal with mean=4.1 and standard deviation = 4 O C. shape unknown with mean=4.1 and standard deviation = 1 O D. shape unknown with mean=4.1 and standard deviation = 4 QUESTION 16 1 points Save Answer The Law of Large Number states that as the sample size increases to the population size, the distance between the sample mean and the population mean approaches zero. O True False QUESTION 17 1 points Save Answer Washing our hands can help curb the spread of coronavirus. This statement isWhich curve in the graph below represents a normal distribution with the smallest standard deviation? Normal PDF curve 0.4 0.3 0.2 0.1 0.0 QUESTION 19 1 points Save Answer Which of the following depicts the Central Limit Theorem most accurately? O A. For any population, it says the sampling distribution of the sample mean is approximately normal, regardless of the sample size. O B. For a sufficiently large sample size, it says the population is approximately normal. O C. For any sample size, it says the sampling distribution of the sample mean is approximately normal. O D. For a sufficiently large sample size, it says the sampling distribution of the sample mean is approximately normal, regardless of the population distribution. QUESTION 20 1 points Save Answer Which one of the following is NOT true regarding the normal distribution? O A. It is symmetric about the mean. O B. It has one mode. O C. The mean, median and mode are all equal. O D. It always has a mean of 0.O C. Binomial; Mp = 180, Up = 11.22 O D. Exactly normal; Up = 0.3, op = 0.019 QUESTION 30 1 points Save Answer To assess attitudes towards issues that affect the residents of a village, the village randomly chose 800 families to participate in a survey of life attitudes. The village received 628 completed surveys. What is the sample proportion of completed surveys? O A. 0.886 O B. 0.628 O C. 1.274 O D. 0.785 ck Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Save and Submit