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**Question 1: If X and Y are independent events, then ______________. Choose two.**

- the occurrence of X affects the occurrence of Y
**the occurrence of X does not affect the occurrence of Y**- the occurrence of Y affects the occurrence of X
**the occurrence of Y does not affect the occurrence of X**

**Question 2: Which of the following method of assigning probabilities is based on historical data? Choose one.**

- Subjective probabilty
**Relative frequency probability**- Classical method
- Objective probablity

**Question 3: True or False. A conditional probability is the probability of one event, given that another event has occurred.**

**True**- False

**Question 4: The most frequently occurring value in a data set is called the _________ of the data set. Fill in the blank.**

**Answer: Mode**

**Question 5: True or False. Stratified random sampling is a method of selecting a sample in which the population is divided into strata, and then random samples are drawn from each stratum**

**True**- False

**Question 6: True or False. Probability is the numerical likelihood that an event will occur.**

**True**- False

**Question 7: True or False. Coefficient of variation is the ratio of the standard deviation to the mean, generally expressed as a percentage.**

**True**- False

**Question 8: Which of the following is a type of sampling distribution? Choose one.**

- Sample distribution of sample standard deviation
- Sample distribution of sample median
- Sample distribution of sample mode
**Sample distribution of sample proportion**

**Question 9: Consider the following data function in Python programming:**

**def x(data)**

**Z = max(data) – min(data)**

**return Z**

**What will the defined data function above calculate? Choose one.**

- Median
- Mode
**Range**- Variance

**Question 10: Median is not applicable to __________ data type. Fill in the blank.**

**Answer: Nominal**

**Question 11: True or False. There are three methods of assigning probabilities.**

**True**- False

**Question 12: True or False. An independent event is always mutually exclusive.**

- True
**False**

**Question 13: True or False. If two groups of numbers have the same mean, then their medians must also be equal.**

- True
**False**

**Question 14: True or False. Pie charts are used for the visualization of categorical data.**

**True**- False

**Question 15: True or False. A mutually exclusive event will always be an independent event.**

- True
**False**

**Question 16: In skewed data, the best measure of central tendency is the __________. Fill in the blank.**

**Answer: Median**

**Question 17: If P = 0.4 and n = 200, what is P(0.40 ≤ p ≤ 0.45)? Choose one.**

- 0.354
**O.4251**- 0.4
- 0.532

**Question 18: True or False. Stratified random sampling is a method of selecting a sample in which various strata are selected from the sample.**

- True
**False**

**Question 19: True or False. It is not impossible to find the median of an odd-numbered data set.**

**True**- False

**Question 20: True or False. Frequency polygons and bar charts are used for continuous data.**

- True
**False**

**Question 21: The 50th percentile of a normally distributed data set will represent its __________. Choose two.**

- Sum
- Range
**Mode****Mean**- Median

**Question 22: True or False. In skewed data, the best measure of central tendency is the Mean.**

- True
**False**

**Question 23: ______________ probabily comes from a person’s intuition or reasoning. Fill in the blank.**

**Answer: Subjective**

**Question 24: Which Python command is used for accessing the second row of an excel file named “data file” having only two rows? Choose one.**

**datafile.tail()**- datafile.loc[0]
- datafile.loc[2]
- datafile.iloc[2]

**Question 25: The Median is applicable for which of the following data types? Choose three.**

- Cardinal
**Interval**- Nominal
**Ordinal****Ratio**

**Question 26: True or False. To get the 3rd, 4th and 5th row of a datafile “df” in Python, the programmer can write: df.loc[2,3,4]**

- True
**False**

**Question 27: If the true proportion of customers below 20 years is given by P = 0.35, what is the probability that a sample size of 100 yields a sample proportion between 0.3 and 0.4? Choose one.**

- 0.53
**0.706**- 0.961
- 0.827

**Question 28: Some CDs produced by a manufacturer are defective. From the production line, 5 CDs are selected and inspected. How many sample points exist in this experiment? Choose one.**

**32**- 30
- 10
- 25

**Question 29: Percentiles are measures of central tendency that divide a group of data into ________ parts. Answer in numeric form.**

**Answer: 100**

**Question 30: An icecream cafe has 200 customers every day. 60% of them like vanilla flavour while 80% of them like mango flavour. If a customer is selected at random, what is the probability that they like either mango or vanilla flavour? Choose one.**

- 0.1
**0.9**- 0.08
- 0.82