In a survey, 23 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $43 and standard deviation of $2. The best point estimate for μ is? The margin of error for a 95% confidence interval is?

Q: In a survey, 12 people were asked how much they spent on their child's last birthday gift. The…

A: Given that  Sample Mean \bar XXˉ = 4343 Sample Standard Deviation (s)(s) = 77 Sample Size…

Q: Before After 6.9 6.3 3.6 2.1 7.3 7.1 12.8 8.6 8.5 8.2 10.1 6.4 8.4 3.9 5.2 2.1

A: We find the differences of ‘before’ and ‘after’. di= Xi-Yi

Q: Since 2007, a psychological association has supported an annual nationwide survey to examine stress…

A:

Q: In a survey, 31 people were asked how much they spent on their child's last birthday gift. The…

A: It is given that sample mean is 45 and standard deviation is 5.

Q: A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements…

A: In case of paired data from a single population or from two identical populations, related samples…

Q: In a survey,  20 people were asked how much they spent on their child's last birthday gift.  The…

A: Solution: Given information: n= 20 Sample size  x= $38 Sample mean s= $7 Sample standard deviation

Q: In a survey, 18 people were asked how much they spent on their child's last birthday gift. The…

A: Given The value of n is 18. The value of s is 18. The value of x=39. The confidence level is 90%.

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 27 people were asked how much they spent on their child's last birthday gift. The…

A: Given that, in a survey, 27 people were asked how much they spent on their child's last birthday…

Q: In a survey, 26 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: You want to purchase a used car. The mean monthly payment for a random sample of 12 cars advertised…

A: Given: n=12x¯=275σ=35 Confidence level = 95%

Q: In a survey, 24 people were asked how much they spent on their child's last birthday gift results…

A:

Q: the standard deviation of the 16 observations was 0.95 inches (again, the sample mean was 17.2).…

A: Given :  Standard deviation of the 16 observations was 0.95 inches & the sample mean was 17.2.…

Q: Provide an interpretation for the confidence interval.

A: Let  be the population mean amount spent per week on gas.Given that,Sample mean Sample size Sample…

Q: In a survey, 15 people were asked how much they spent on their child's last birthday gift. The…

A: The random variable X follows normal distribution. We have to construct 98% confidence interval.…

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…

Q: In a survey, 13 people were asked how much they spent on their child's last birthday gift. The…

A: GivenMean(x)=42standard deviation(s)=7sample size(n)=13

Q: In a survey, 26 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 31 people were asked how much they spent on their child's last birthday gift. The…

A: Given: σ = $ 2  n = 31

Q: at the university spend on groceries each month. From a sample of 29 random students, you find that…

A: Given that  Sample size n =29 Sample mean =871.35 Standard deviation =235.06 NOTE:- According to…

Q: In a survey, 12 people were asked how much they spent on their child's last birthday gift. The…

A: Determine the best point estimate of the population mean. The best point estimate of the population…

Q: An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city…

A: Given, Sample size = 719 Sample mean = 23.7 Population standard deviation = 9.7   Since the…

Q: In a survey, 20 people were asked how much they spent on their child's last birthday gift. The…

A: Given, n=20x¯=37s=19 The best point estimate for μ is x¯=37.

Q: The mean amount of money spent per week on gas by a sample of 32 Oxford drivers was found to be…

A: Solution-:Given: We want to For \alpha==1-c=1-0.95=0.05Step 1 of 4: Calculate the margin of error…

Q: In a survey, 30 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 23 people were asked how much they spent on their child's last birthday gift. The…

A: Solution: Let X be the amount. From the given information, x-bar=$30 and S=$10. The confidence level…

Q: Anystate Auto Insurance Company took a random sample of 362 insurance claims paid out during a…

A:

Q: In a sample of 31 students, the mean scholarship amount received was $562, with a standard deviation…

A: Given data,n=31x=562s=17.04df=n-1=30α=0.10t-critical value at α=0.10 and df=30 is tc=1.697

Q: A school social worker wishes to estimate the mean amount of time each week that high school…

A:

Q: In a survey, 27 people were asked how much they spent on their child's last birthday gift. The…

A: The mean is $36 and the standard deviation is $6.

Q: How much does a sleeping bag cost? Backpacker Magazine took a random sample of the cost of 31…

A: Given: n = 31 X = 119.75 s = 17.20 Formula Used: Confidence Interval = X ± tsn

Q: You measure 46 backpacks' weights, and find they have a mean weight of 36 ounces. Assume the…

A:

Q: In a sample of 32 students, the mean scholarship amount received was $887, with a standard deviation…

A: Given information: n=32x¯=887s=27.4 df=n-1=32-1=31 Confidence level is 90% Significance level is…

Q: If the mean flying time for a sample of 65 pilots was 15.6 hours per month, and the population…

A:

Q: In a survey, 31 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: A research team surveyed 251 adult Ohioans and found the mean monthly grocery cost for a single…

A: A research team surveyed 251 adult Ohioans and found the mean monthly grocery cost for a single…