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Question: Find out numbers of smartphone users who keep their phone with themselves at the time of sleeping. Answer: The report has found that almost three quarters of the smart phone users sleep with the smartphone (Sleep Review, 2015). The focus of the research was to find out numbers of smartphone users who keep their phone with themselves at the time of sleeping. So, here, the population refers to the determining the total numbers of users who sleep with the smartphone in Bedroom. For determining the population, a telephone survey was conducted. The sample size of the survey was 1000 which is used to determine the population. The results of the report has found out that the 71% of the total respondents reported that they sleep with their smartphone. The report has also found that the users are not only sleep with phone but they also keep their phone in several times in the entire day (in home) which are as follows: (i) In the morning: 35% (ii) Before coffee: 17% (iii) At the time of toothbrush: 17% (iv) In other time (10%) In consideration of sleeping with a smartphone, the results show that almost 55% of the respondents keep their smartphone on the night stand. 13% respondents reported that the phone is on the bed and about 3% of total respondents reported that the phone is in the hand. On the other side, a quarter of respondents (24%) said that they do not keep the phone with them at time of sleeping due to hygiene advice. The survey also determines that a quarter of smartphone users have fallen asleep with that keeping in their hand at some of their lives in United States. But, in case of young age group (18-24 years), the percentage was almost double. The survey was done taking 1000 respondents throughout the United States and the ages of respondents were above 18 years. Despite of that, an additional survey was done choosing 300 respondents in 9 target markets. In case of statistical survey, it is required to consider the margin of error. It is considered due to the selecting of sampling size. In case of larger sample size, the margin of error will be less (Tamhane, 2009). So, large sample size is more preferable than the smaller sample size. But, it is required too much capital and time for the larger sample size. So, the sample size is selected on the basis of available resources (Bowerman, O'Connell Murphree, 2009). Therefore, it is required to consider the margin of error in case of statistical analysis. The margin of error can be calculated by using the following formula: E = z/2/(2 n) In case of statistical analysis, another thing is needed to consider that is confidence interval. Generally, 95% confidence interval is considered for statistical research (Kayis, Pinarkara, Uygan Hakki, 2009). Here, two types of margin errors are considered due to conducting of an additional survey. In case of national quota (n= 1000), the margin of error is as follows: E = 1.96/(2 1000) = +/- 3.1% [ at 95% confidence level, the critical value of z/2 = 1.96) In case of oversampled market (n=300), the margin of error is as follows: E = 1.96/(2 300) = +/- 5.7% Reference List Bowerman, B., O'Connell, R., Murphree, E. (2009).Business statistics in practice. Boston: McGraw-Hill Irwin. Kayis, S., Pinarkara, E., Uygan, S., Hakki, E. (2009). Evaluation of confidence interval estimates of cluster analysis in molecular marker data.New Biotechnology,25, S305. doi:10.1016/j.nbt.2009.06.936 Sleep Review. (2015). Nearly Three-Quarters Sleep With Smartphone in Bedroom - See more at: https://www.sleepreviewmag.com/2015/07/nearly-three-quarters-sleep-smartphone-bedroom/#sthash.6tqzdkA0.dpuf. Retrieved from https://www.sleepreviewmag.com/2015/07/nearly-three-quarters-sleep-smartphone-bedroom/ Tamhane, A. (2009).Statistical analysis of designed experiments. Hoboken, N.J.: Wiley.