According to a 2018 survey of student loan debt incurred to finance undergraduate education, the statistics are: X̅  = $25,786.74, the presumed population standard deviation is $9,155.70, and n = 1,000. Please Note: The t-value with 999 degrees of freedom is 1.962.      1. Which standardized score is more appropriate: z-values or student-t?           Explain your answer.      2. What would happen to the confidence interval if you changed the               level of confidence to 99%?     3. What would happen to the confidence interval if you increase the                sample size?

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

A: Solution:

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

A:

Q: Salaries of 25 college graduates who took a statistics course in college have a​ mean of $82,426 and…

A: Given information Sample size(n) = 25 Sample mean x̅  = $82426 Population standard deviation = $2000…

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

A:

Q: In a test of the effectiveness of garlic for lowering cholesterol, 50 subjects were treated with…

A: Given,sample size(n)=50sample mean(x¯)=3.1standard deviation(S)=16.9degrees of freedom…

Q: T randomly selected 50 text books and found their mean cost to be $248.47 with a standard deviation…

A: Given information is :n=50x=$248.47S=$27.43And also given that 95% confidence interval is…

Q: In a survey, 30 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: interval at a 95% confidence level. Give your answers to one decimal place. Interpret your…

A: Given : Sample Size, n = 18 Sample Mean, x̄ = 35 sample standard…

Q: 15. A random sample of 100 visitors to a popular theme park spent an average of $142 on the trip…

A: SOLUTION: Given average x=142          standard deviation σ=47.5          random sample n=100

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

A: Given  sample size n=32 mean x¯=$33 standard deviation s=$12 confidence level =80%,…

Q: Salaries of 11 college graduates who took a statistics course in college have a​ mean of $78,782 and…

A: Given that, n=11, x=$78782, σ=$2000. The 100(1-α)% confidence interval for the population mean is…

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

A:

Q: Salaries of 25 college graduates who took a statistics course in college have a​ mean of $87,169 and…

A: Introduction: The 100 (1 – α) % confidence interval for the population standard deviation, σ, is the…

Q: Given a mean of 483, a standard deviation of 29, and a sample size of 60, construct a 95 %…

A: A mean of 483, a standard deviation of 29, and a sample size of 60, construct a 95% confidence…

Q: In a survey, 21 people were asked how much they spent on their child's last birthday gift. The…

A: A confidence interval is an interval that is used to estimate the unknown parameter. The lowest…

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

A: According to the provided information, Mean = 34 Standard deviation = 12 Significance level = 90%…

Q: Almost all employees working for financial companies in New York City receive large bonuses at the…

A: Here we have,   sample size : n = 63sample average bonus: x¯ = $50,000sample standard deviation : s=…

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

A:

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

A: See the handwritten solution

Q: Several years ago, 50% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given Data Sample Size, n = 1105 Number of successes, x = 491.0 confidence…

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

A: Givensample size(n)=20Mean(x)=50standard deviation(s)=19c=90%

Q: You are doing a problem that requires you to use the Student's T-table. a.) If the number of…

A: Note: Thank you for the question. Since multiple questions are posted, according to our policy, we…

Q: In a survey, 32 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: According to the College Board, scores on the math section of the SAT Reasoning college entrance…

A: Given information, Mean =516 Standard deviation =116

Q: In a survey, 22 people were asked how much they spent on their child's last birthday gift. The…

A: It is given that n=22, x=34 and s=5. At 98% confidence level, the value of z is 2.326.

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

A: Given  Sample mean x̄=31, s=sample standard deviations=17, n=20

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

A: We have given that  Sample size n =23 Sample mean =42  Standard deviation =8

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

A: given data,n=30bell shaped distribution μ=47σ=6CI=0.80we have to find out the confidence interval…

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

A: Given,sample size(n)=30sample mean(x¯)=$30standard deviation(s)=$16degrees of…

Q: The in-city gasoline mileage per gallon was computed for two economy automobiles, each for 40 tanks…

A: From the provided information, n1=40x1=22.3s1=1.1n2=40x2=25.1s2=1.3 Confidence level = 90%

Q: In a survey, 22 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 22 Sample mean (x̅) = $50 Sample standard deviation…

Q: In a survey, 10 people were asked how much they spent on their child's last birthday gift. The…

A: We have given that  Sample Mean(x̄) = 46, standard deviation(s)= 8 And sample size (n) = 10 Then,…

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.