The mean annual car insurance premium for young drivers in the UK was £1503. A study was conducted to find out if it is cheaper to get insured in a rural area like Gwynedd. A sample of 25 young...

The mean annual car insurance premium for young drivers in the UK was £1503. A study was conducted to find out if it is cheaper to get insured in a rural area like Gwynedd. A sample of 25 young drivers from Gwynedd have a mean annual premium of £1440 with a standard deviation s = £165

Develop a hypothesis test that can be used to determine whether the mean annual premium in Gwynedd is lower than the national mean annual premium
What is a point estimate of the difference between the mean annual premium in Gwynedd and the national mean?

At α= 0.05, test for a significance difference. What is your conclusion?