In a survey, 32 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $41 and standard deviation of $12. Construct a confidence interval at a 95% confidence level. Give your answers to one decimal p

Q: Interpret the results. OA. You can be certain that the population mean price of the stock is either…

A: It is given that • The 90% confidence interval is CI = ( 109.87, 115.13 )• The 95% confidence…

Q: ou measure 38 textbooks' weights, and find they have a mean weight of 43 ounces. Assume the…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: na survey, 25 people were asked how much they spent on their child's last birthday gift. The results…

A: Given data,

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

A: It is given that  Sample mean = 49.3 Sample standard deviation, s = 11 Sample size, n = 24…

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: You measure 43 textbooks' weights, and find they have a mean weight of 75 ounces. Assume the…

A: Given Information: Sample size (n) = 43 Sample mean (x¯) = 75 Population standard deviation (σ) =…

Q: You measure 49 textbooks' weights, and find they have a mean weight of 78 ounces. Assume the…

A: You measure 49 textbooks' weights, and find they have a mean weight of 78 ounces. Assume the…

Q: You measure 36 textbooks' weights, and find they have a mean weight of 53 ounces. Assume the…

A:

Q: You measure 27 textbooks' weights, and find they have a mean weight of 80 ounces. Assume the…

A: Given that Sample size =27 Sample mean =80 Population standard deviation =3.6 We have to find 95%…

Q: You measure 43 textbooks' weights, and find they have a mean weight of 55 ounces. Assume the…

A:

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: We need to construct the 95% confidence interval for the population mean.

Q: In a survey, 49 people were asked how much they spent on their child's last birthday gift. The…

A: From the available information, Sample Side,n=49 Sample mean, Sample standard deviation, s=15 The…

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

A: Sample size n =12 Sample mean=30 Standard deviation =19

Q: You measure 30 textbooks' weights, and find they have a mean weight of 78 ounces. Assume the…

A: When population sd known, use z test.

Q: In a survey, 38 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: You measure 45 textbooks' weights, and find they have a mean weight of 68 ounces. Assume the…

A: Consider,

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

A: Given that n=27, s=6, Confidence level=95%

Q: You measure 42 textbooks' weights, and find they have a mean weight of 60 ounces. Assume the…

A:

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

A: Given that  Sample size (n) = 20 The results are normally distributed. (Bell shaped) Sample Mean…

Q: In a survey, 45 people were asked how much they spent on their child's last birthday gift. The…

A: Given, The degrees of freedom is obtained as- The critical value of t at 0.05 level of…

Q: n a survey, 44 people were asked how much they spent on their child's last birthday gift. The…

A: Given, Sample size =44 Sample mean = 73 Sample standard deviation = 20 Confidence level =95% Degrees…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: In a survey, 17 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: You measurê 33 textboöks' weights, and find they have a mean weight of 44 ounces. Assume the pa…

A: As the population standard deviation is known, we will use z-distribution. Given: Xˉ=44 σ=10.1 n=33…

Q: In a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: You measure 39 textbooks' weights, and find they have a mean weight of 34 ounces. Assume the…

A:

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

A: The summary of statistics is, x¯=30,s=16,n=18 The degree of freedom is, df=n-1   =18-1   =17…

Q: In a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: ure 49 textbooks' weights, and find they have a mean weight of 72 ounces. Assume the population…

A: As the population standard deviation is known the critical value at 95% confidence level is:

Q: In a survey, 14 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 40 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey,  17 people were asked how much they spent on their child's last birthday gift.  The…

A: Solution: Given information: n= 17 Sample size  x= $37  Sample mean s= $11 Sample standard deviation…

Q: n a survey, 35 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 35 Sample mean (x̅) = $56 Sample standard deviation…

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

A: The sample mean is 32 and standard deviation is 14.

Q: You measure 32 textbooks' weights, and find they have a mean weight of 59 ounces. Assume the…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: In a survey, 48 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: You measure 29 textbooks' weights, and find they have a mean weight of 40 ounces. Assume the…

A:

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, 35 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 40 people were asked how much they spent on their child's last birthday gift. The…

A: Given data,μ=50σ=2n=40z-value at 95% confidence is Zc=1.96