Estimate the average hours spent studying

Assignment Help Basic Statistics

Reference no: EM133777473

Question 1

A logistics company conducted a study to measure the average delivery time for packages in a specific region. They collected data from a random sample of 25 deliveries and found that the average delivery time was 42.5 minutes. The population standard deviation of 4.8 minutes was recorded previously.

Required:
Assuming the delivery times follow a normal distribution, calculate the 99% confidence interval for the mean delivery time.

Question 2

Professor Kim is conducting a study on the weekly study habits of university students in a specific program. The findings from this study aim to identify trends in study behaviours and potentially inform academic support services.

To estimate the average hours spent studying per week, Professor Kim selects a random sample of 15 students from the program. After collecting the data, the sample mean study time is found to be 14 hours. Given that the population standard deviation of 3.5 hours was recorded in the previous study and assume data follows Normal distribution.

Required:
Using the 6-step hypothesis testing method discussed in this course, assess whether Professor Kim can conclude, with 99% confidence, that the population mean weekly study time is less than 16 hours.

Question 3

A national furniture retailer has expanded across three key markets: metropolitan areas, suburban areas, and rural regions. To explore whether there are significant differences in sales revenue based on location, the company performed an analysis of variance (ANOVA).

ANOVA: Single Factor       Count   Sum   Average   Variance
SUMMARY   Metropolitan   12   4820   401.67   7200.33
   Suburban   12   4680   390   6700
   Rural   12   3200   266.67   3200

ANOVA   Source of Variation   SS   df   MS   F value   F crit
   Between Groups   A   B   D   F   G
   Within Groups   188104   C   E
   Total   322390   35

Required: Using the 6-step process of hypothesis testing learned in this unit, complete the ANOVA table above A-G and at 5% significance level, decide whether there are any significant differences between the sales revenue across 3 locations.

Question 4

A business consulting firm is helping a chain of restaurants analyse customer satisfaction scores across three types of locations: Region A, Region B, and Region C. The firm has collected feedback data from customers in each region to determine whether satisfaction levels vary significantly based on location.

Required:
Describe three scenarios where a parametric test should be applied to compare the satisfaction scores between the three regions and three situations where a non-parametric test would be more appropriate due to the characteristics of the data or the assumptions.

Question 5

A global electronics company recorded its smartphone shipments for 5 of the last 6 months of 2023, as shown below. Use two forecasting methods; Linear Trend Equation and Weighted Moving Average (with weights of 0.5, 0.3 and 0.2) to predict December shipments and determine which method is more accurate. Provide all steps of your calculations.

Month    Smartphones Shipped (1000s of Units)
July    180
August    190
September    210
October    240
November    280
December    ?

Reference no: EM133777473

Questions Cloud

Do you think it was justified given the circumstances : What do you think of the discounting scheme that KAR had used historically? Do you think it was justified given the circumstances?

Briefly present your best motivation for making transition : Briefly present your own best motivation for making this transition, and then present and develop the best objection to this move.

What are critical assets that seven eleven japan own : What are the critical assets that Seven Eleven Japan own? What are the critical assets that Inditex/ ZARA own?

Discuss your response or the response of others involved : Discuss your response or the response of others involved. What were the consequences of this situation? How could the situation have been prevented?

Estimate the average hours spent studying : Estimate the average hours spent studying per week, Professor Kim selects a random sample of 15 students from the program. After collecting the data

Would the common element best be described as an aspect : Would the common element best be described as an aspect of distributive, procedural, or restorative justice or does it not clearly fall under any of these?

Under the main heading alternatives : Under the main heading Alternatives, develop a list of options for the organization of your choice.

Mentoring plays crucial role in promoting leadership : Mentoring plays a crucial role in promoting leadership and enhancing the quality of education in the early development education sector.

Develop gui applications using javafx : Develop a GUI Application, named TheReadingRoom, which allows users to buy books at The Reading Room book shop

User Account

All Pages