answer correctly please these two questions 1) Explain in 300 words. Please give
ID: 409572 • Letter: A
Question
answer correctly please these two questions
1) Explain in 300 words. Please give work-related examples for each of the following:
1. Mutually Exclusive Events
2. Collectively Exhaustive Events
3. Statistically Independent Events
4. Statistically Dependent Events
2) Please select any quantitative problem you wish as it relates to your current employment. If not currently employed, use any of your previous employments. If never employed, or if you wish to use a different business, use Wal-Mart. The problem can be something that is past, present, or in the potential future. List each step of the problem, beginning with "Defining the Problem". Explain your problem in detail (do not include any information that is sensitive). There are 7 total steps; please elaborate on each step. here are the seven steps :
Determine Research Questions: Focused questions are at the heart of actionable qualitative research. In fact, they are at the heart of good quantitative research as well and play a key role in Lean UX thinking. Are users not using the mobile app because of usability, security concerns or something else? How do users make decisions about how to invest: do they ask a friend, use a financial advisor, or research on their own?
Design the Study: Getting input from users instead of just internal discussions is an essential first step. With research questions defined, the “What” of the study has been established. Now think Who, When, Where and How. There are logistical advantages and challenges to collecting the data you need. It’s a matter of trading them off.
Who: For in-person sessions, figure out who will be attending: both the type of participant and the facilitators. All the usual guidelines for recruiting participants apply here. It’s often valuable to have a product stakeholder participate along with the facilitators. Back when I worked at Intuit, we’d have both a UX researcher and a product manager attend in-home sessions with users. It was the PM who would ultimately decide what goes into products, so having them see and hear users first hand was impactfulWhere: Determine if you will collect data at participants’ homes, in a coffee shop, in a company conference room, or in a usability lab.
When: Will this occur during one week or over different seasons, buying periods, or product releases? Is it during working hours, weekends, or after work? Days and times impact both the types of participants, their attitudes and potentially your findings.
How: Work out the details of what the participants will do, if anything, and what you need to have ready to collect data. When attending a remote location, we come equipped with a notepad and portable usability lab (basically a laptop, webcam and software).
Collect Data: The qualitative researcher should assume the role of an unobtrusive observer and have little impact on the settings being observed—whether it be watching participants use existing products at home or in a more controlled lab environment. Qualitative is often used synonymously with small samples, but one can take a qualitative approach to larger sample sizes (more than 50 participants) just as one can take a quantitative approach to small sample sizes (less than 10).
Analyze Data: Most qualitative research studies generate a lot of data. Creating a system for coding actions and notable quotes helps speed through the process of turning utterances into actionable insights.
Generate Findings: What was learned from engaging users? This step involves synthesizing the copious amount of notes, videos and artifacts. As many of the responses from participants will be open-ended, there will be a need to identify patterns. For example, when we were interviewing users about why they didn’t pay their credit card bill on their mobile phone, we didn’t ask users if they had security concerns. Instead, many of them voiced the concern in their own words and stories.
Validate findings: One of the best ways to validate findings is to triangulate using other methods, including surveys or additional sources. One weakness of qualitative research is that it is hard to establish external validity, that is, to provide corroborating evidence that the findings aren’t just the opinion of the researcher. Every researcher, of course, does bring with her biases on the problems with a product or what deserves emphasis in the interview.One approach to minimize this researcher bias is to include a section on the interviewer or principal investigator’s background and how it might influence their conclusions. Having recordings of sessions and detailed notes helps other interested parties come to their own conclusions and can help validate findings. Including verbatims along with the interpretation also helps others see how the conclusions were drawn.
Report : We usually deliver a power point with backup notes or an appendix with more detailed findings and verbatims. While information comes in sequentially from each participant, we find reporting the data in an inverted pyramid by issue works best. We start with the most important findings, and then note the number of participants that supported these findings and some good quotes to support what we concluded. We also provide confidence intervals around the issue and insight frequency so readers have some idea about the prevalence of an issue in the larger user population.
Explanation / Answer
Answer 1.
1) Mutually exclusive events are the two events that cannot happen at the same time. If one event is taking place, there is no chance of the second event to also tale place at the same time. For example, while tossing a coin, head and tail both cannot come at the same time. So tossing a head and tail in a coin are mutually exclusive events.
Example with solution:
Question: If one card is being pulled from a deck of 52 cards, what is the probability that it will be a king or a queen?
Solution: If king is A, probability of getting a king- P(A)= 4/52= 1/13 (there are 4 king cards in a deck of 52 cards)
If queen is B, probability of getting a queen- P(B)= 4/52= 1/13 (there are 4 queen cards in a deck of 52 cards)
Having a king or a queen are mutually exclusive events as we can have either one of them.
The probability of getting king or queen is -
P(A or B)= P(A) + P(B)= 1/13+1/13= 2/13.
2) Collectively exhaustive events are a set of events in which at least one event is sure to happen. For example, in a dice of 6, the outcome of 1,2,3,4,5,6 are collectively exhaustive as these are all the possible outcomes that can derive from the event.
Example with solution:
Question: if a dice is rolled, are the following events exhaustive?
Getting prime numbers, getting composite numbers, getting 1.
Solution: though there is no formula for calculating collectively exhaustive events but he probability can be seen through following steps,
Event of getting prime numbers: X = (2,3,5)
Event of getting composite numbers: Y = (4,6)
Event of getting 1: Z = (1)
All these events are collectively exhaustive.
3) Statistically independent events is when the occurrence of one event does not effect the probability of the occurrence of the other event. For example, getting the head side up in a coin while tossing it and getting a 4 number in a dice while rolling it. These two events are independent of each other and can happen at the same time.
Example with solution:
Question: If a coin is tossed and dice is rolled, what is the probability of tail side of the coin and number 5 on a dice?
Answer:
Probability of drawing the king first: P(A)= 4/52
Probability of drawing the jack second: P(B)= 4/51
P (A and B) = P(A). P(B) = 4/52. 4/51=
Probability of tail- P(T)=1/2
Probability of number 5- P(5)= 1/6
P (T and 5)= P(T) . P(5) = 1/2 .1/6 = 1/12
4) Statistically dependant events is when the occurrence of one event is effecting the occurrence of the second event. For example in a deck of 52 cards, if one card is drawn which is king of red, the probability of another red king will be less in 51 cards.
Example with solution:
Question: if two cards are drawn from a deck of 52 cards together, what is the probability that one card is king and second is jack?
Answer:
Probability of king at first -P(A) = 4/52
Probability of jack at second- P(B) = 4/51
P(A and B)= P (A). P(B) = 4/52.4/51= 16/2652 = 4/663.
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